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Astronomy
Term | Definition |
---|---|
Solar system | The Sun and all other objects in orbit around it. |
Planets | Round objects in space that are satellites of the Sun. |
Telescope | Instruments that allow us to see far away things appear close. |
Comet | Made up of mostly ice with rocks and dust. This moves in a long narrow orbit. |
Asteroids | Large chunk of rock or metal in space. A belt of these separate the inner and outer planets. |
Meteor | A piece of asteroid that has broken off and has entered the Earth’s atmosphere. Small forms of this burn up in Earth’s Atmosphere and do not reach Earth’s Surface. |
Inner planets | Mercury, Venus, Earth, Mars. These planets are small and rocky. Warmer and closer to the sun. These are more like Earth. |
Outer planets | Jupiter, Saturn, Uranus, Neptune. These planets are large and are made up of a lot of gas. There surface is mainly made of hydrogen and helium. They all have a ring system, even though they may be hard to see. |
Rotation | The act of spinning. The Earth has one of these each day. |
Axis | Real or imaginary line that an object spins around. |
Revolution | When one object travels around another. The Earth does one of these every 365 ¼ days. |
Tides | The daily rise and fall of the ocean’s surface. |