|The Milky Way is one of billions of galaxies in the ____.
|____ is the hottest planet due to a runaway greenhouse effect.
|Polaris is commonly known as the ____.
|The largest of Saturn's moons is ____.
|Unlike the other planets, ____ has no substantial atmosphere.
|The Moon is three times larger than ____.
|Jupiter's four largest moons were discovered by ____ in 1610.
|The ____ is about a hundred times larger than the Earth.