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