| On average, Earth is ____ million miles (1 AU) from the Sun. |
3 |
| Earth rotates about ____ times per orbit around the Sun. |
4 |
| The Moon is ____ times larger than the dwarf planet Pluto. |
8 |
| The Big Bang occurred a little less than ____ billion years ago. |
14 |
| About ____ planets have been discovered in the Milky Way. |
93 |
| There are ____ planets in the Solar System. |
100 |
| Earth is almost ____ times larger than the Moon. |
365 |
| The Sun is about ____ times larger than the Earth. |
5,100 |
