|Most dwarf planets (including Pluto) are within the ____ belt.
|Nicolaus ____ proved that the planets orbit the Sun.
|The Milky Way is one of billions of galaxies in the ____.
|The ____ is about a hundred times larger than the Earth.
|Other than the Sun, the brightest star seen from Earth is ____.
|The ____ occurred about 13.6 billion years ago.
|The ____ comet can be seen about every 75 years.
|____ orbits between Jupiter and Neptune.