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Asteroids An overview of Asteroids: Asteroids are huge boulders of metal and rock found mostly in the asteroid belt, between the orbits of Mars and Jupiter. Comets Comets can be described as 'dirty snowballs'. They consist mainly of ice, metals, rock and gases. Earth The Earth is the third, and largest, of the terrestrial planets of the inner Solar System. Glossary of Astronomical Terms A glossary explaining the terms Altitude, Azimuth, Constellation, Elevation, Galaxy, Light-year, Meridian, Transit, Twilight and Zenith. Jupiter Jupiter is the largest planet in our Solar System, a thousand times the size of the Earth in volume. It is the second brightest planet in our night sky and has been known since ancient times. Mars Mars is the last of the four terrestrial or rocky planets of the inner Solar System. Visible in our night skies as a bright, reddish object, it has been known since ancient times. Mercury Mercury is the closest planet to the Sun. It is one of the four terrestrial or rocky planets of the inner Solar System. Neptune Neptune's rocky core is covered by a thick, cold atmosphere of hydrogen, helium and methane. This atmosphere appears blue due to the methane gas. Pluto Pluto was long considered to be different to the eight major planets, being neither a terrestrial planet nor a gas giant. It is now considered to be a "dwarf planet". Saturn Saturn is one of the Gas Giants of the outer Solar System. It is most famous for its spectacular ring system.
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