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Whats In Your Solar System

Across
Its distance from the Sun and its nearly circular orbit allow water to exist on its surface in all three state-- solid, liquid, and gas
____ and Mercury are the only two planets closer to the sun than earth
Was discovered accidentally in 1781, when a bluish object was observed moving relative to the stars
A form of hydrogen that has properties of both a liquid and a metal, which can exist only under conditions of very high pressure
The existence of ____ was predicted before it was discovered, based on small deviations in the motion of Uranus and the application of Newton's universal law of gravitation
This planet is often referred to as the red planet
____ is the largest planet
Down
Mercury has a planetwide system of cliffs called...
Are high, cool, light-colored clouds that rise
They are similar in density to earth and have solid, rocky surfaces.
Are low, warm, dark-colored clouds that sink
Are all very large, ranging from 15 to more than 300 times the mass of earth
Is the second-largest planet in the solar system
Is the planet closest to the sun, and for this reason it is difficult to see from earth