Planet Facts

A planet is a large object such as Jupiter or Earth that orbits a star. It is smaller than a star, and it does not make light. Planets are ball-shaped (spheres). Objects that orbit planets are called moons. There are eight planets in the Solar System. See the fact file below for more information about the planets.
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  • All eight planets can be seen with a small telescope or binoculars.
  • Venus is the brightest planet and can be seen without a telescope.
  • The earth has more water than it has land.
  • Mars is home to the largest volcano in our solar system. It is almost 17 miles high.
  • Jupiter is the largest planet. All of the other planets could fit inside Jupiter. The red spot on Jupiter is the most violent storm in the Universe.
  • Saturn is the lightest of all the planets. It is also the second largest.
  • One year on Neptune lasts 165 Earth years!
  • Uranus orbits while lying on its side, because its axis is at 97 degrees.
  • Mercury and Venus have no moons. The Earth has 1 moon. Mars has 2 moons. Neptune has 13 moons. Uranus has 21 moons. Saturn has 33 moons. Jupiter has 63 moons.
  • All of the outer planets, (Jupiter, Saturn, Uranus, Neptune and Uranus) have rings.

External resources

Planets for Kids
A Parade of New Planets
Amazing Space
Bodies in the Solar System
Exploring Planets
From Mercury to Pluto
Ordering the Planets
Planetary Fact Sheet
 Planetary Linguistics
The Planets
Planetary Photojournal
Planets for Kids
Planets, Moons, & Stars
Solar System Simulator
Space Science Hotlist: Planets
Welcome to the Planets
Your Weight In Other Worlds
Zoom Astronomy: The Planets


Mercury Facts
Astronomy: Mercury
Messenger: Mercury
NSSDC: Mercury
Solar Voyager
Spacetech Orrery: Mercury: Closest to the Sun
The Planet Mercury
Welcome to the Planets: Mercury
Windows to the Universe: Mercury


Venus Facts
Magellan Mission to Venus
Magellan Mission to Venus 1
NASA: Mariner 1 & 2
NSSDC Photo Gallery: Venus
PDS Imagining Node
Pioneer Venus Project Information
Space Tech’s Orrery: Venus: Globally Warmed
The Planet Venus
Welcome to the Planets: Venus
Windows to the Universe: Venus


Earth Facts
Earth Observatory: The Blue Marble
Earth, Sun & Moon
NSSDC Photo Gallery: Earth
SpaceTech’s Orrery: Earth: Our Home
The Great Globe Gallery
The Nine Planets: Earth
Welcome to the Planets: Earth
Windows to the Universe: Earth


Mars Facts
Center for Mars Exploration
CNN: Exploring Mars
Daily Martian Weather Report
Exploring Mars
Exploring Mars 1
Exploring Mars 2
Exploring the Planets: Mars
Mars Academy
Mars Millennium Project
Mars Team Online
NASA: Mars Exploration
Planet Mars
SpaceTech Orrery: Mars: The Red Planet
Welcome to the Planets: Mars
Windows to the Universe: Mars


Jupiter Facts
Cassini Image Gallery:  Jupiter Encounter
Eleven New Moons for Jupiter
Jupiter: Millennium Flyby
Jupiter’s Ring System
NSSDC Photo Gallery: Jupiter
Satellites of Jupiter
Solar System Exploration: Jupiter
SpaceTech’s Orrery: Jupiter: Giant Failed Star
The Planet Jupiter
Welcome to the Planets: Jupiter
Windows to the Universe: Jupiter


Saturn Facts
Animated Saturn
CNN: Journey to Saturn
NASA: Cassini-Huygens: Mission to Saturn & Titan
NSSDC Photo Gallery: Saturn

Saturn 1
Saturn’s Ring Systems

Spacecraft Cassini is Visiting Saturn
SpaceTech’s Orrery: Saturn: Ringed Beauty
Welcome to the Planets: Saturn
Windows to the Universe: Saturn


Uranus Facts
NSSDC Photo Gallery: Uranus
SpaceTech’s Orrery: Uranus: Tilted Extremes
The Planet Uranus
Uranus: Neptune’s Twin
Welcome to the Planets: Uranus
Windows to the Universe: Uranus
Wolfram Research: Uranus


John Couch Adams and the Discovery of Neptune
Mathematical Discovery of the Planets
NSSDC Photo Gallery: Neptune
Neptune Facts
SpaceTech’s Orrery: Neptune: The Ice Giant
Welcome to the Planets: Neptune
Windows to the Universe: Neptune


Pluto Facts

How Did Pluto Form?

Pluto 1
Pluto 2
Pluto the Accidental Planet
Pluto: The Ninth Planet
Solar Space Station: Pluto
Spacetech’s Orrery: Pluto
Welcome to the Planets: Pluto
Windows to the Universe: Pluto
Fast Facts Resources
The Nine Planets Solar System Tour
Planets:  Zoom Astronomy