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Solar System

Across
Number of years between the average sun cycle
The sun's source of engery is the nuclear fusion of this element
Mostly found between orbits of Mars and Jupiter
The time it takes for a planet to return to the same location in the sky, relative to the sun.
Planet with a density that would allow it to float in a bathtub
Planet that is similar in size to the moon
Contains the majority of mass of all the other planets
Down
Gas causing Neptune and Uranus to appear blue in color
Rising and sinking of hot and cold gases within the sun
Gas that primarily constituents our atmosphere