| A | B |
|---|
| Rotation | spin around and around |
| Revolve | has the same meaning as orbit |
| Orbit | move in a circular path around another object |
| Sun | The star in the middle of our solar system |
| core | The center of a space object such as the Sun or a planet |
| Moon | The object that orbits Earth |
| Revolution | One complete path of the Earth around the Sun |
| One Day | The amount of time it takes for Earth to rotate one time on its axis |
| One Year | The amount of time it takes for Earth to revolve (orbit) one time around the Sun. (365 Days) |
| Axis | An imaginary line that runs from the North Pole to the South Pole through the center of the Earth |
| Tilt | We experience different seasons on Earth because of this |
| Star | An object in space that is made out of gases and gives off its own heat and light and light energy |
| Sunspot | A cool spot on the Sun |
| Solar Flare | Hot gases erupting on the surface of the Sun. This normally occurs in the sunspot |
| Corona | The Sun's outer atmosphere |
| Gravity | A force that pulls everything to the center of the Earth |
| Equator | An imaginary line that circles the Earth halfway between the North and South Poles |
| Northern Hemisphere | the half of the Earth that is north of the equator |
| Southern Hemisphere | the half of the Earth that is south of the Equator |
| Gravitational pull of the Sun | Keeps planet in orbit around it |
| Gravitational pull of the Moon | Causes ocean tides |
| Daily | happens at least once each day |
| Weekly | happens or occurs at least once a week |
| Seasonal | happens or occurs with each season, or with a change of season |
| Asteroid | A large space rock that orbits the Sun |
| Meteoroid | A small space rock that orbits the Sun |
| Meteor | A streak of light made by a burning meteoroid in the Earth's atmosphere |
| Comet | A chunks of ice and dust that orbit the Sun |
