2423574
Description
Flashcards by joliverhouse, updated more than 1 year ago
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Created by joliverhouse
over 9 years ago
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| Question | Answer |
| P1 REVISION THE EARTH in the UNIVERSE | . |
| How many planets are in the solar system | There are eight planets in the solar system |
| Other than planets, name three things that orbit the sun. | Dwarf planets, comets and dust |
| Approximately how old is the solar sytem? | The Solar system is about 5 thousand million years old. |
| What is the source of the Sun's energy? | The fusion of hydrogen nuclei. |
| What are comets made of? | They are balls of rock, dust and ice. |
| Roughly, how many stars make up the Milky Way? | 100 000 000 000 stars!!!! |
| What is a light year? | A light year is the distance light travels through a vacuum in one year. |
| Roughly, how many times larger is the diameter of the Milky Way than the diameter of the Sun? | 600 billion times the diameter of the Sun. |
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