|Most dwarf planets (including Pluto) are within the ____ belt.
|Phobos and Deimos are the two moons of ____.
|____ is tilted over 90° and thus rolls on its side as it orbits the Sun.
|Jupiter's four largest moons were discovered by ____ in 1610.
|The Moon is three times larger than ____.
|Unlike the other planets, ____ has no substantial atmosphere.
|The ____ occurred about 13.6 billion years ago.
|The ____ comet can be seen about every 75 years.