Meet your travel agency

Cosmic Detour Travel Company. No refunds after launch.

Your planetary guideJill Platts, NASA Solar System Ambassador

The itineraryEight planets in order, beginning with Earth and ending at Neptune.

The inspectionWeather, attractions, dangers, packing needs, and one very honest rating.

The evidenceReal NASA facts, real mission images, and questionable vacation advice.

Hand-drawn space passport with planet stamps

Tonight’s flight plan

From Earth to Neptune. About 4.5 billion years of scenery.
1EarthHabitable benchmark
2MercuryExtreme temperature swings
3VenusExtreme greenhouse world
4MarsCold desert world
5JupiterGiant storm system
6SaturnRings and ocean moons
7UranusSideways ice giant
8NeptuneFast winds at the edge

The travel time is fictional. The distances, weather, and hazards are real.

How we rate a vacation

Scenery matters. Survival matters more.
★☆☆☆☆
Remote exploration

Best studied by robotic spacecraft.

★★☆☆☆
Extreme expedition

Requires advanced life support and protection.

★★★☆☆
Strong orbital tour

The wider planetary system makes the trip worthwhile.

★★★★☆
Exceptional journey

A major scientific destination with remarkable scenery.

★★★★★
Habitable benchmark

Breathable air, liquid water, and solid ground.

Earth

Destination 01 · The control group

“Oceans, atmosphere, and a living biosphere.”

The only destination with breathable air, liquid oceans, and known life. Coffee is available before departure.

Third planet from the SunAbout 12,700 km wideOnly known world with life
Habitable benchmark · 5 stars
Hand-drawn Earth on white paper
Source: National Aeronautics and Space Administration. (n.d.). Facts about Earth. NASA Science. https://science.nasa.gov/earth/facts/

Earth conditions: unreasonably pleasant

23.9 hoursOne rotation
365.25 daysOne orbit
1 moonNatural satellite
  • Weather: wildly varied, but liquid water persists across the surface.
  • The lower atmosphere is about 78% nitrogen and 21% oxygen.
  • Wild fact: Oceans cover about 71% of Earth. It is the only known world with stable liquid water on its surface.
  • Earth’s magnetic field deflects much of the solar wind before it reaches the surface.
Earth as a blue-and-white globe photographed by the Apollo 17 crew
NASA image · National Aeronautics and Space Administration. (1972, December 17). Apollo 17: Blue Marble [Photograph]. NASA.
Source: National Aeronautics and Space Administration. (n.d.). Facts about Earth. NASA Science. https://science.nasa.gov/earth/facts/

Earth’s must-see attractions

  1. Liquid oceansStable surface water is the rarest resort amenity on tonight’s itinerary.
  2. A living biosphereFrom microbes to redwoods to library audiences: extraordinary chemical complexity.
  3. A magnetic-field light showAuroras appear when charged particles interact with gases high in the atmosphere.
Green and red aurora and airglow arc above Earth’s nighttime horizon as seen from the International Space Station
NASA image · NASA Earth Observatory. (2020, August 16). Aurora, meet airglow [Photograph]. NASA Science. Credit: ISS Expedition 62 Crew Earth Observations Facility.
Source: National Aeronautics and Space Administration. (n.d.). Facts about Earth. NASA Science. https://science.nasa.gov/earth/facts/

Earth traveler advisory

Survival briefing

  • Storms, earthquakes, volcanoes, and other travelers
  • Ultraviolet radiation and temperature extremes
  • Weather-related hazards, disease, and environmental change

Recommended gear

Layered clothing, sunscreen, a water bottle, and curiosity. Oxygen equipment is optional.

Cosmic Detour rating
★★★★★
5.0 out of 5

The only complete vacation package: breathable air, liquid water, and a stable surface.

Best featureStable oceans and a living biosphere

Main challengeNatural hazards and climate extremes

Source: National Aeronautics and Space Administration. (n.d.). Facts about Earth. NASA Science. https://science.nasa.gov/earth/facts/

Mercury

Destination 02 · The closest world to the Sun

“Extreme heat, deep cold, and very long days.”

Small, fast, cratered, and close enough to the Sun that daylight arrives at up to seven times Earth’s intensity.

Closest planet to the SunAbout 4,880 km wideSmallest planet
88-day orbit · 176-day solar day
Hand-drawn cratered Mercury on white paper
Source: National Aeronautics and Space Administration. (2025, April 25). Mercury facts. NASA Science. https://science.nasa.gov/mercury/facts/

Mercury conditions: check both forecasts

88 Earth daysOne year
176 Earth daysSunrise to sunrise
0 moonsAlso zero rings
  • Day: up to 800°F / 430°C. Night: down to −290°F / −180°C.
  • Mercury has almost no atmosphere. It has only a very thin exosphere, so heat escapes at night.
  • Wild fact: From some locations, the Sun appears to rise, briefly set, then rise again.
  • Mercury moves around the Sun faster than any other planet, at about 29 miles / 47 km per second.
Global mosaic of cratered Mercury made from MESSENGER spacecraft images
NASA image · National Aeronautics and Space Administration. (2011, December 1). Mercury globe: 0°N, 270°E [Image]. NASA Science. Credit: NASA/Johns Hopkins APL/Carnegie Institution of Washington.
Source: National Aeronautics and Space Administration. (2025, April 25). Mercury facts. NASA Science. https://science.nasa.gov/mercury/facts/

Mercury’s must-see attractions

  1. Caloris BasinA giant impact basin about 960 miles / 1,550 km across.
  2. Crater rays and mile-high scarpsBright impact debris and cliffs created as Mercury cooled and shrank.
  3. Polar water iceIce can survive inside permanently shadowed craters on the planet closest to the Sun.
Color-coded perspective view across Mercury’s Caloris Basin made from MESSENGER images and elevation data
NASA image · National Aeronautics and Space Administration. (2015, May 1). In tribute [Image]. NASA Science. Credit: NASA/Johns Hopkins APL/Carnegie Institution of Washington. Colors encode terrain information.
Source: National Aeronautics and Space Administration. (2025, April 25). Mercury facts. NASA Science. https://science.nasa.gov/mercury/facts/

Mercury traveler advisory

Survival briefing

  • Extreme heat, deep cold, solar radiation, and micrometeoroids
  • No breathable atmosphere and almost no insulation
  • Sunrise to sunrise takes 176 Earth days

Recommended gear

A radiation shelter, industrial heat shield, deep freeze gear, and several clocks.

Cosmic Detour rating
★☆☆☆☆
1.0 out of 5

Scientifically fascinating and best experienced from a protected spacecraft.

Best featurePolar ice beside the Sun

Main challengeExtreme surface temperatures

Source: National Aeronautics and Space Administration. (2025, April 25). Mercury facts. NASA Science. https://science.nasa.gov/mercury/facts/

Venus

Destination 03 · Earth’s cloud-covered twin

“Bright clouds above a hidden volcanic surface.”

Nearly Earth-sized, permanently clouded, and proof that an atmosphere can be much too effective.

Nearly the size of EarthAbout 90% of Earth gravityNo moons
93× surface pressure · No moons
Hand-drawn cloud-covered Venus on white paper
Source: National Aeronautics and Space Administration. (n.d.). Venus facts. NASA Science. https://science.nasa.gov/venus/venus-facts/

Venus conditions: the extreme greenhouse

872°F / 467°CTypical surface
93× EarthSurface pressure
243 Earth daysOne rotation
  • Weather: carbon dioxide, sulfuric-acid clouds, and a runaway greenhouse effect.
  • The pressure feels like being more than 3,000 ft / 930 m underwater on Earth.
  • Wild fact: Venus rotates backward, and one rotation takes longer than its 225-day year.
  • Winds high in the clouds race around Venus in about four Earth days.
Two spacecraft views of Venus wrapped in pale global clouds, one with cloud contrast enhanced
NASA image · National Aeronautics and Space Administration. (2020, June 8). Venus from Mariner 10 [Image]. NASA Science. Credit: NASA/JPL-Caltech; processing: Kevin M. Gill.
Source: National Aeronautics and Space Administration. (n.d.). Venus facts. NASA Science. https://science.nasa.gov/venus/venus-facts/

Venus’s must-see attractions

  1. Maxwell MontesThe planet’s highest mountain region rises about 7 miles / 11 km.
  2. Volcanic plains and pancake domesVenus has more volcanoes than any other planet in the solar system.
  3. A day longer than a yearRotation: 243 Earth days. Orbit: about 225 Earth days.
Computer-simulated globe of Venus created from Magellan radar data with simulated surface colors
NASA image · National Aeronautics and Space Administration. (1996, November 12). Venus computer simulated global view [Radar-derived image]. NASA Science. Credit: NASA/JPL.
Source: National Aeronautics and Space Administration. (n.d.). Venus facts. NASA Science. https://science.nasa.gov/venus/venus-facts/

Venus traveler advisory

Survival briefing

  • Heat hot enough to melt lead
  • Surface pressure about 93 times Earth’s
  • Corrosive cloud droplets higher in the atmosphere

Recommended gear

A titanium pressure vessel, active refrigeration, acid resistant equipment, and no balcony plans.

Cosmic Detour rating
½ STAR
0.5 out of 5

A compelling target for exploration, but not a practical surface destination.

Best featureVolcanoes hidden beneath the clouds

Main challengeSurface heat and pressure

Source: National Aeronautics and Space Administration. (n.d.). Venus facts. NASA Science. https://science.nasa.gov/venus/venus-facts/

Mars

Destination 04 · The cold desert neighbor

“A familiar day beneath a thin, dusty atmosphere.”

The most familiar alien landscape. It is cold, dry, full of robots, and full of evidence that water once reshaped the surface.

About half Earth’s widthAbout 38% of Earth gravityTwo small moons
24.6-hour sol · Two small moons
Hand-drawn Mars on white paper
Source: National Aeronautics and Space Administration. (n.d.). Mars facts. NASA Science. https://science.nasa.gov/mars/facts/

Mars conditions: cold desert, familiar clock

24.6 hoursOne sol
687 Earth daysOne year
2 moonsPhobos + Deimos
  • Weather: cold, dry, and dusty beneath a thin carbon-dioxide atmosphere.
  • Global dust storms can hide the surface for weeks.
  • Wild fact: Mars is the only planet where robots have roamed across the landscape.
  • Surface pressure averages less than 1% of Earth’s, so unprotected liquid water quickly boils or freezes.
Global color mosaic of Mars showing rusty terrain, dark volcanic regions, Valles Marineris, and the north polar cap
NASA image · National Aeronautics and Space Administration. (1998, June 8). Global color views of Mars [Image]. NASA Science. Credit: NASA/JPL-Caltech/USGS.
Source: National Aeronautics and Space Administration. (n.d.). Mars facts. NASA Science. https://science.nasa.gov/mars/facts/

Mars’s must-see attractions

  1. Olympus MonsThe solar system’s largest volcano rises about 16 mi / 25 km above the surrounding plains.
  2. Valles MarinerisA canyon system more than 1,800 mi / 3,000 km long and up to about 5 mi / 8 km deep.
  3. Ancient deltas and lakebedsRock records preserve clues to a wetter past and perhaps past habitability.
Viking Orbiter mosaic of Mars centered on the vast Valles Marineris canyon system
NASA image · National Aeronautics and Space Administration. (2013, July 9). Valles Marineris: The Grand Canyon of Mars [Image]. NASA Science. Credit: NASA/JPL-Caltech.
Source: National Aeronautics and Space Administration. (n.d.). Mars facts. NASA Science. https://science.nasa.gov/mars/facts/

Mars traveler advisory

Survival briefing

  • An unbreathable atmosphere and high radiation exposure
  • Deep cold, abrasive dust, and planet wide storms
  • Gravity only about 38% as strong as Earth’s

Recommended gear

A pressurized habitat, oxygen, radiation shielding, dust seals, thermal layers, and patient robots.

Cosmic Detour rating
★★½☆☆
2.5 out of 5

The most practical surface destination after Earth, but only with major life support.

Best featureA surface full of readable history

Main challengeMassive life-support needs

Source: National Aeronautics and Space Administration. (n.d.). Mars facts. NASA Science. https://science.nasa.gov/mars/facts/

Jupiter

Destination 05 · The giant

“No solid surface. An atmosphere on a giant scale.”

More than twice as massive as every other planet combined, wrapped in centuries-old storms, and accompanied by a miniature solar system of moons.

About 11 times Earth’s widthAbout 318 Earth masses115 recognized moons
9.9-hour day · 115 recognized moons
Hand-drawn Jupiter with cloud bands and Great Red Spot
Source: National Aeronautics and Space Administration. (n.d.). Jupiter facts. NASA Science. https://science.nasa.gov/jupiter/jupiter-facts/

Jupiter conditions: maximum planet

9.9 hoursShortest planetary day
~12 Earth yearsOne orbit
115 moonsOfficially recognized
  • Weather: ammonia and water clouds in hydrogen and helium.
  • The Great Red Spot is bigger than Earth and has raged for hundreds of years.
  • Wild fact: If Jupiter were hollow, about 1,000 Earths could fit inside.
  • Jupiter’s magnetic field is roughly 16 to 54 times as powerful as Earth’s.
True-color global mosaic of Jupiter showing banded clouds and the Great Red Spot
NASA image · National Aeronautics and Space Administration. (2003, November 13). Cassini Jupiter portrait [Image]. NASA Jet Propulsion Laboratory. Credit: NASA/JPL/Space Science Institute.
Source: National Aeronautics and Space Administration. (n.d.). Jupiter facts. NASA Science. https://science.nasa.gov/jupiter/jupiter-facts/

Jupiter’s must-see attractions

  1. The Great Red SpotA storm wider than Earth and roughly 300 mi / 500 km deep below the cloud tops.
  2. The Galilean moonsVolcanic Io, ocean-world Europa, giant Ganymede, and cratered Callisto.
  3. Polar cyclone polygonsJuno revealed stable geometric arrangements of giant storms around both poles.
New Horizons family portrait showing Jupiter’s moons Io, Europa, Ganymede, and Callisto at their relative sizes
NASA image · National Aeronautics and Space Administration. (2007, May 1). Jupiter’s moons: Family portrait [Image]. NASA Science. Credit: NASA/Johns Hopkins APL/Southwest Research Institute.
Source: National Aeronautics and Space Administration. (n.d.). Jupiter facts. NASA Science. https://science.nasa.gov/jupiter/jupiter-facts/

Jupiter traveler advisory

Survival briefing

  • Intense radiation near the planet
  • Pressure and temperature increase rapidly with depth
  • No solid surface anywhere below the clouds

Recommended gear

A heavily shielded orbiter, redundant electronics, and a strict rule against descending.

Cosmic Detour rating
★★★☆☆
3.0 out of 5 system

The planet is inaccessible, but its extraordinary moon system makes the journey worthwhile.

Best featureFour extraordinary Galilean moons

Main challengeNo solid surface and intense radiation

Source: National Aeronautics and Space Administration. (n.d.). Jupiter facts. NASA Science. https://science.nasa.gov/jupiter/jupiter-facts/

Saturn

Destination 06 · The postcard

“Spectacular rings. No solid surface.”

A pale gas giant with a ring system wide enough to stop conversation. Several moons may hide oceans and ingredients for life.

About 9 times Earth’s widthAbout 95 Earth masses293 confirmed moons
293 moons · Rings of ice and rock
Hand-drawn Saturn and its rings on white paper
Sources: National Aeronautics and Space Administration. (n.d.). Saturn facts. NASA Science. https://science.nasa.gov/saturn/facts/; NASA Science. (2026, August). Saturn moons. https://science.nasa.gov/saturn/moons/

Saturn conditions: breezy, buoyant, enormous

10.7 hoursOne rotation
29.4 Earth yearsOne orbit
293 moonsConfirmed as of Aug. 2026
  • Weather: hydrogen-helium clouds, powerful storms, and equatorial winds near 1,100 mph / 1,800 km/h.
  • Saturn is the only planet with an average density lower than water.
  • New in 2026: Hubble revealed an evolving 10-sided wave around Saturn’s south pole.
  • A hexagonal jet stream surrounds the north pole and keeps its shape while storms move through it.
Natural-color Cassini mosaic of golden Saturn, its rings, and the north-pole hexagon
NASA image · National Aeronautics and Space Administration. (2013, October 25). Jewel of the Solar System [Image]. NASA Jet Propulsion Laboratory. Credit: NASA/JPL-Caltech/SSI/Cornell.
Sources: National Aeronautics and Space Administration. (n.d.). Saturn facts. NASA Science. https://science.nasa.gov/saturn/facts/; NASA Science. (2026, August). Saturn moons. https://science.nasa.gov/saturn/moons/

Saturn’s must-see attractions

  1. The ringsBillions of ice-and-rock particles; up to 175,000 mi / 282,000 km across, often only about 30 ft / 10 m thick.
  2. EnceladusAn icy moon spraying water-rich material from a global ocean into space.
  3. TitanA thick atmosphere with lakes and seas of liquid methane and ethane.
Crescent Enceladus with water-ice plumes backlit at its south pole in a Cassini image
NASA image · National Aeronautics and Space Administration. (2011, April 18). Plumes and a crescent [Photograph]. NASA Science. Credit: NASA/JPL/Space Science Institute.
Source: National Aeronautics and Space Administration. (n.d.). Saturn facts. NASA Science. https://science.nasa.gov/saturn/facts/

Saturn traveler advisory

Survival briefing

  • No solid ground on the planet
  • Extreme winds, pressure, cold, and radiation
  • Ring particles move at orbital speeds

Recommended gear

A panoramic window, moon landers, radiation protection, and the widest camera lens available.

Cosmic Detour rating
★★★½☆
3.5 out of 5 system

Exceptional from orbit. The rings and moons make this a memorable planetary system.

Best featureRings, Titan, and Enceladus

Main challengeNo solid surface

Source: National Aeronautics and Space Administration. (n.d.). Saturn facts. NASA Science. https://science.nasa.gov/saturn/facts/

Uranus

Destination 07 · The sideways world

“Extreme seasons on a world tilted sideways.”

An ice giant tipped almost completely onto its side, with dark rings, extreme seasons, and a year longer than most human lifetimes.

About 4 times Earth’s width29 known moonsOne close spacecraft visit
97.77° tilt · 84-year orbit
Hand-drawn pale blue Uranus tilted within its rings
Sources: National Aeronautics and Space Administration. (n.d.). Uranus facts. NASA Science. https://science.nasa.gov/uranus/facts/; NASA Space Place. (2026, July 31). How many moons does each planet have? https://spaceplace.nasa.gov/how-many-moons/

Uranus conditions: four seasons, no hurry

17 hoursOne rotation
84 Earth yearsOne orbit
97.77°Axial tilt
  • Weather: bitter cold, methane-tinted atmosphere, winds up to about 560 mph / 900 km/h.
  • A pole can face the Sun while the opposite hemisphere endures a 21-year dark winter.
  • Wild fact: Uranus was the first planet discovered with the aid of a telescope, in 1781.
  • Its atmosphere can fall to about minus 371°F / minus 224°C, among the coldest measured on any planet.
Voyager 2 view of Uranus as a nearly featureless pale blue globe
NASA image · National Aeronautics and Space Administration. (1986, December 18). Uranus as seen by NASA’s Voyager 2 [Image]. NASA Science. Credit: NASA/JPL-Caltech.
Source: National Aeronautics and Space Administration. (n.d.). Uranus facts. NASA Science. https://science.nasa.gov/uranus/facts/

Uranus’s must-see attractions

  1. The sideways ring systemThirteen known rings make the planet’s extreme tilt visually obvious.
  2. Twenty-nine literary moonsNames come from characters in Shakespeare and Alexander Pope.
  3. A magnetic field off-kilterThe magnetic axis is tilted about 60° from the rotation axis and offset from the center.
Representative-color James Webb Space Telescope infrared view of Uranus and its vertical-looking ring system
NASA image · National Aeronautics and Space Administration. (2023, April 6). Uranus (NIRCam image) [Representative-color infrared image]. NASA Science. Credit: NASA, ESA, CSA, STScI; Joseph DePasquale.
Sources: National Aeronautics and Space Administration. (n.d.). Uranus facts. NASA Science. https://science.nasa.gov/uranus/facts/; NASA Space Place. (2026, July 31). How many moons does each planet have? https://spaceplace.nasa.gov/how-many-moons/

Uranus traveler advisory

Survival briefing

  • No solid surface on an ice giant
  • Extreme cold, fast winds, and deep atmospheric pressure
  • A single season lasts about 21 Earth years

Recommended gear

Serious insulation, a long term calendar, low light cameras, and a flexible itinerary.

Cosmic Detour rating
★★☆☆☆
2.0 out of 5

A rare scientific destination with beautiful rings, unusual seasons, and severe conditions.

Best featureSideways rings and strange seasons

Main challengeExtreme cold and long travel time

Source: National Aeronautics and Space Administration. (n.d.). Uranus facts. NASA Science. https://science.nasa.gov/uranus/facts/

Neptune

Destination 08 · The windy edge

“Four hours from sunlight, with the fastest planetary winds.”

The farthest major planet: an ice giant whose location was predicted with mathematics before it was confirmed by telescope.

About 4 times Earth’s width16 known moonsOne close spacecraft visit
30 AU from the Sun · Winds above 1,200 mph
Hand-drawn blue Neptune with clouds and a dark storm
Source: National Aeronautics and Space Administration. (n.d.). Neptune facts. NASA Science. https://science.nasa.gov/neptune/neptune-facts/

Neptune conditions: dim, deep, fast

16 hoursOne rotation
165 Earth yearsOne orbit
30 AU30× Earth to Sun distance
  • Weather: methane clouds and the fastest planetary winds above 1,200 mph / 2,000 km/h.
  • Sunlight takes about four hours to arrive; high noon resembles dim twilight.
  • Wild fact: Neptune was the first planet located by mathematical prediction before direct observation.
  • Neptune radiates more than twice as much energy as it receives from the Sun.
Voyager 2 full-disk view of blue Neptune showing the Great Dark Spot and bright clouds
NASA image · National Aeronautics and Space Administration. (1998, October 30). Neptune full disk view [Image]. NASA Science. Credit: NASA/JPL.
Source: National Aeronautics and Space Administration. (n.d.). Neptune facts. NASA Science. https://science.nasa.gov/neptune/neptune-facts/

Neptune’s must-see attractions

  1. Great dark stormsEarth-sized systems appear and disappear in Neptune’s active atmosphere.
  2. TritonA captured moon in retrograde orbit with geysers spraying icy material more than 5 mi / 8 km high.
  3. Ring arcsDust mysteriously clumps into bright segments instead of spreading evenly.
Voyager 2 global color mosaic of Neptune’s pink-and-gray icy moon Triton
NASA image · National Aeronautics and Space Administration. (1998, June 4). Global color mosaic of Triton [Synthesized-color image]. NASA Science. Credit: NASA/JPL/USGS.
Source: National Aeronautics and Space Administration. (n.d.). Neptune facts. NASA Science. https://science.nasa.gov/neptune/neptune-facts/

Neptune traveler advisory

Survival briefing

  • The fastest planetary winds
  • Deep cold, crushing pressure, and no solid surface
  • A radio message takes roughly four hours one way

Recommended gear

A nuclear power source, autonomous navigation, wind rated equipment, and long duration provisions.

Cosmic Detour rating
★★☆☆☆
2.0 out of 5

A dramatic world of fast winds and distant moons, best explored robotically.

Best featureTriton, dark storms, and ring arcs

Main challengeDistance, cold, and extreme winds

Source: National Aeronautics and Space Administration. (n.d.). Neptune facts. NASA Science. https://science.nasa.gov/neptune/neptune-facts/

Distance changes the light

One way sunlight travel time. These are not spacecraft travel times.
Mercury
3.2 min
Venus
6 min
Earth
8.3 min
Mars
13 min
Jupiter
43 min
Saturn
80 min
Uranus
2 h 40 min
Neptune
4 h

Earth receives sunlight in 8.3 minutes.That is our local definition of seeing the Sun now.

A Neptune conversation takes about eight hours.Four hours for the question and four more for the reply.

Source: National Aeronautics and Space Administration. (n.d.). Planets. NASA Science. https://science.nasa.gov/solar-system/planets/ Distances and light-time values are rounded.

Rocky worlds at a glance

Destination Day Year Known moons Surface gravity Travel headline
EarthRocky planet 23.9 h 365.25 d 1 1.00 g Breathable luxury
MercuryRocky planet 59 d rotation 88 d 0 0.38 g Thermostat broken
VenusRocky planet 243 d rotation 225 d 0 0.90 g Extreme greenhouse
MarsRocky planet 24.6 h 687 d 2 0.38 g Cold desert world

Closest clockA Martian day lasts 24.6 hours.

Slowest spinVenus needs 243 Earth days to rotate.

Rare luxuryOnly Earth keeps liquid oceans on its surface.

Source: National Aeronautics and Space Administration. (n.d.). Planets. NASA Science. https://science.nasa.gov/solar-system/planets/ Day values use rotation periods; Mercury’s solar day lasts 176 Earth days.

Giant worlds at a glance

Destination Day Year Known moons Width vs. Earth Travel headline
JupiterGas giant 9.9 h 12 y 115 About 11 times Moon hopping only
SaturnGas giant 10.7 h 29.4 y 293 About 9 times Best window seat
UranusIce giant 17 h 84 y 29 About 4 times Sideways seasons
NeptuneIce giant 16 h 165 y 16 About 4 times Windy finale

Fastest spinJupiter rotates once every 9.9 hours.

Longest yearNeptune needs 165 Earth years.

Moon richThese four systems currently total 453 known moons.

Sources: National Aeronautics and Space Administration. (n.d.). Planets. NASA Science. https://science.nasa.gov/solar-system/planets/; NASA Science. (2026, August). Saturn moons. https://science.nasa.gov/saturn/moons/; NASA Space Place. (2026, July 31). How many moons does each planet have? https://spaceplace.nasa.gov/how-many-moons/ Retrieved October 19, 2026; moon counts may change.

You may book exactly one

Assume a magical safe spacecraft. The destination stays realistic.
01Mercury or Venus

You want close-up study of extreme rocky-world environments.

02Mars

You want world class geology and at least one place to stand.

03Jupiter or Saturn

You came for rings, storms, and the best moons on the tour.

04Uranus or Neptune

You prefer strange seasons, fast winds, and unfinished maps.

One rule: defend your choice with one real fact.

The official unofficial ranking

1

EarthComplete travel package

2

Saturn systemRings and ocean moons

3

MarsBest surface geology

4

Jupiter systemStorms and standout moons

5

NeptuneDramatic blue frontier

6

UranusUnique seasons and rings

7

MercuryA world of extremes

8

VenusSpectacular from orbit

Scientific conclusion: every planet is a magnificent world, even when the vacation planning is complicated.

Hand-drawn solar system travel postcards and a rocket
Eight destinations. One very unofficial list.

What these challenging vacations teach us

01Atmospheres matter

Mercury loses heat; Venus traps it; Earth balances liquid water; giants turn gases into weather worlds.

02Size changes everything

Small rocky worlds cool and crater. Giant planets hold thick atmospheres, rings, and vast moon systems.

03Habitability is rare

Earth’s ordinary-seeming air, water, magnetic field, and moderate temperatures form an extraordinary combination.

Hand-drawn comparison of Mercury, Venus, Earth, Jupiter, and Saturn

Questions and more NASA science

NASA Solar System Ambassadors

Space science in your community

Trained volunteers share current NASA missions and discoveries at libraries and other community events. The program connects audiences with reliable NASA science and free learning resources.

25+ yearsof public engagement

1,100+volunteers nationwide

11 million+people reached

Jill Platts
NASA Solar System Ambassador

QR code for Solar System Ambassador information and NASA resources

Scan to keep exploringFind an Ambassador or event and discover more NASA resources.

Source: National Aeronautics and Space Administration. (n.d.). Solar System Ambassadors. NASA Science. https://science.nasa.gov/engage/solar-system-ambassadors/