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is the first planet from the sun and is also the smallest planet of the solar system. mercury has yet to be entirely mapped, making it the least known planet in our system.

is the second planet from the sun and is often called earth's sister due to its many similarities with the blue planet. however, a strong greenhouse effect gives venus the hottest climate in the solar system.

is the third planet from the sun, and the densest and fifth-largest of the eight planets in the solar system. sometimes referred to as the blue planet, earth is the only known planet to harbor life.

is the fourth planet from the sun. named after the roman god of war, mars is often described as the "red planet" and is the site of olympus mons, the highest known mountain in the solar system.

is the fifth planet from the sun and is the largest planet of the solar system. jupiter has 63 known satellites, the biggest of which are called the four galilean moons : io, europa, ganymede and callisto.

is the sixth planet from the sun and is the second largest planet in our system. despite its size (9.4 earths), saturn's density is so low that it would float on water if there was a large enough ocean.

is the seventh planet from the sun and is the coldest in the solar system. altough the first pictures taken by voyager 2 showed a featureless, pale-blue planet, astronomers later discovered the complex atmosphere of uranus.

is the eighth and farthest planet from the sun. neptune has been approached only once by a man-made object, voyager 2 space probe, in 1989. most of our knowledge of neptune comes from this first and only flyby.