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Bob the Alien's Tour of the Solar System
The Sun Mercury Venus Earth The Moon Mars Jupiter Saturn Uranus Neptune Pluto and Dwarf Planets Comets


Space A to Z

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Word Meaning
Paaliaq moon of saturn
Pallene moon of saturn
Pan moon of saturn
Pandora moon of saturn
Particle
Pasiphae moon of jupiter
Pasithee moon of jupiter
Perdita
Periodic Comet
Phobos moon of mars
Phoebe moon of saturn
Photosphere
Planet Spherical object which orbits a star. Planets can vary greatly in size although are never larger than the star they orbit. Planets can be rocky or gaseous. Smaller planets tend to have solid surfaces whereas larger planets are balls of mostly gas. There are eight planets known to orbit the Sun and at least 270 planets known to orbit other stars (these planets are known as extrasolar planets or exoplanets).
Planetary Nebula
Pluto Tiny world orbiting the Sun in a very elliptical orbit, going as close as 4,443,000,000 km from the Sun to as far as 7,682,900,000 km away from it. Regarded as the ninth planet in the Solar System since its discovery in 1930 until being reclassified as a Dwarf Planet in 2006. Pluto takes 248 years to complete an orbit around the Sun. With a diameter of 2,280 km, Pluto is smaller than Earth's moon. Orbiting Pluto are 3 known moons: Charon, Hydra and Nix.
Poles
Polydeuces moon of saturn
Portia
Praxidike
Prometheus moon of saturn
Prospero
Proteus
Psamathe
Puck

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