Messenger of the gods. Mercury Closest planet to the Sun and the eighth largest.     mass: 3.30 x 1023 kg     orbit: 57,910,000 km (0.38 AU) from Sun     diameter: 4,880 km Mercury is always very near the Sun and difficult to see in the early sunset or pre-dawn. It is best pursued with small telescopes and binoculars when at its greatest eastern or western elongation, that is when its angular deviations are at a maximum with the Sun as it appears to swing back and forth from the morning to the evening skies. Mercury has no known moons. High-Resolution Image of Mercury Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto

Goddess of love and beauty. Venus Second planet from the Sun and the sixth largest.     mass: 4.869 x 1024 kg     orbit: 108,200,000 km (0.72 AU) from Sun     diameter: 12,103.6 km Venus shows phases when viewed with a telescope from the perspective of Earth because it is closer to the Sun than the Earth. When seeing part of its unlit side it presents a crescent or gibbous shape, much like our Moon. The reflected sunlight from Venus is very bright. On a dark moon-less night you may see your shadow from the light of Venus. Venus has no known moons. High-Resolution Image of Venus Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto

Old English word. The only planet not named after a god. Earth Third planet from the Sun and the fifth largest.     mass: 5.972 x 1024 kg     orbit: 149,600,000 km (1.00 AU) from Sun     diameter: 12,756.3 km It was not until the 16th century that the idea began to spread and be accepted that the Earth was a planet in the same sense as the other planets that orbit the Sun. Earth has only one moon, which is unlike any of the other satellite bodies in the solar system. It is extremely large yet relatively distant from its parent planet. Other moons of the solar system tend to be classified as natural satellites or captured planetoids. The naturals are mostly large with circular orbits, very near the parent planet, aligned with the planet's equator. Captured planetoids tend to be small with eccentric orbits inclined to the equator and relatively distant from the parent planet. The Earth's moon does not fit into either of these categories very well. Thousands of artificial satellites have been placed in orbit around the Earth. High-Resolution Image of Earth Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto

God of war. Mars Fourth planet from the Sun and the seventh largest.     mass: 6.4219 x 1023 kg     orbit: 227,940,000 km (1.52 AU) from Sun     diameter: 6,794 km In an amateur telecope Mars varies greatly depending on its orbital relationship with Earth. When it is close, it is easy to see a white polar cap and dark features on the lower latitudes. Mars has two very small moons which are very close to the surface of the planet. Their names are Phobos and Deimos (Fear and Terror). High-Resolution Image of Mars Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto

King of the gods. Jupiter Fifth planet from the Sun and the largest.     mass: 1.900 x 1027 kg     orbit: 778,330,000 km (5.20 AU) from Sun     diameter: 142,984 km (at the equator) Viewing the surface features depends greatly on seeing conditions. Usually a 6" or 8" diameter telescope with reveal the Great Red Spot, which is a giant cyclonic storm about three times the size of Earth. The lateral bands on the surface are alternately colored: The darker ones ranging from brick red to light peach and the lighter ones ranging from aqua to light grey. Sometime you will see a black dot slowly travelling across the surface of the planet; a shadow from an intervening moon. Jupiter has more than 60 known moons including four that were discovered in 1610 when Galileo was the first to view it through a telescope. Their names are Io, Europa, Ganymede and Callisto. They can be seen easily through binoculars or a small telescope. High-Resolution Image of Jupiter Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto

God of agriculture, father of Jupiter. Saturn Sixth planet from the Sun and the second largest.     mass: 5.68 x 1026 kg     orbit: 1,429,400,000 km (9.54 AU) from Sun     diameter: 120,536 km (at the equator) Saturn's rings are beautiful even in small amateur telescopes, especially when the planet is at its greatest tilt to the Earth, exposing the maximum surface area of the ring system. The rings are extremely thin compared to the width. They are about 250,000 km or so in diameter, but they're less than one kilometer thick. The ring particles are composed primarily of water ice, with some rocky particles with icy coatings. Saturn has more than 30 moons. The largest, Titan, is prominent in views through a small telescope. High-Resolution Image of Saturn Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto

God of the sky, father of Saturn. Uranus Seventh planet from the Sun and the third largest.     mass: 8.683 x 1025 kg     orbit: 2,870,990,000 km (19.218 AU) from Sun     diameter: 51,118 km (at the equator) It is difficult for beginners with small telescopes to find Uranus. It may appear as a bluish-green star. In slightly larger scopes it will look more like a disk and less like a point. An interesting thing about this planet is that unlike most of the planets, which spin on an axis nearly perpendicular to the plane of the ecliptic, Uranus' axis is almost parallel to the ecliptic. It seems tipped on its side. Uranus has at least 27 moons. The largest are named after characters in Shakespeare plays. Others are named after characters in writings by Alexander Pope. High-Resolution Image of Uranus Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto

God of the sea. Neptune Eighth planet from the Sun and the fourth largest.     mass: 1.0247 x 1026 kg     orbit: 4,504,000,000 km (30.06 AU) from Sun     diameter: 49,532 km (at the equator) Like Uranus it is difficult for beginners with small telescopes to find it. It usually appears simply as a bluish-green star. In slightly larger scopes it will look more like a disk and less like a point of light. Neptune has at least 13 moons. The biggest is named Triton. High-Resolution Image of Neptune Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto

God of the underworld. Pluto Now officially classified as a "dwarf planet," Pluto crosses inside the orbit of Neptune for part of its orbit. It is smaller by far than the planets. Pluto is smaller than seven of the solar system's moons.     mass: 1.27 x 1022 kg     orbit: 5,913,520,000 km (39.5 AU) from Sun (average)     diameter: 2274 km (at the equator) In earth-bound telescopes Pluto looks like a star. To know if you are observing it, make a drawing of the star field when you think you have found Pluto. Come back in a couple of weeks and find the field again. If it was Pluto it will have moved slightly in relation to the backdrop of stars. Pluto has a moon named Charon which is named after the mythical ferry boat operator who take souls across the River Acheron to Hades. High-Resolution Image of Pluto Mercury | Venus | Earth |Mars | Jupiter | Saturn |Uranus | Neptune |* Pluto