| A | B |
|---|
| Revolution | One complete trip around the sun |
| Orbit | the path an object takes around another. |
| Satellite | An object in orbit around a planet. |
| Planet | orbits a star |
| Star | giant ball of hot gas that produces light, heat and energy. |
| Galaxy | made up of billions and billions of stars |
| Universe | everything...all mater and energy that is in existence. |
| Gravity | the force that controls the movement of our solar system and universe |
| Hubble Space Telescope | a powerful telescope in orbit around the earth |
| International Space Station | an orbiting structure where peaple can live and work in space |
| Sphere | a perfectly round 3-D object like a ball |
| Solar System | A sun and everything within reach of its gravity. |
| Rotation | one complete spin of the earth on its axis (causes day and night) |
| Start of Summer | June 21/22 |
| Start of Winter | December 21/22 |
| Start of Spring | March 21/22 |
| Start of Fall | September 21/22 |
| Equinox | When day and night are the same amount of time |
| Season when the sun is highest in the sky and rays are most direct | Summer |
| Season when the sun is low in the sky and suns rays are less intense | Winter |
| Atmosphere | gases that circle our earth |
| Asteroid | large chunks of rock that orbit a star |
| Comet | large mass of ice and dust that orbit the sun comes from oort cloud |
| Meteor | small rock that enters the earths atmosphere (shooting star) |
| Meteorite | Meteor that makes it to earth (space rock) |
| Moon | natural satellite that orbits a planet |
| Terrestrial planets | densy rocky inner plannets (Mercury, Venus, Earth, Mars) |
| Outer Gas Giants | Jupiter, Saturn, Uranus, Neptune |
| Distance from the earth to sun | 93 million miles |
| tilt of the Earth's axis | 23.5 |
| Name of Longest Day of the Year | Summer Solstice |
| Name of Shortest Day of the Year | Winter Solstice |
| telescope | instrument for viewing distant objects |
| Solar System | a star and all the planets and objects that orbit around it |
| Name of the Galaxy we live in | Milky Way |
