| A | B |
|---|
| rotation | Turning in place [on its axis] |
| 24 hours | Time of one rotation of the earth |
| axis | The imaginary line thru the North and South poles |
| revolution | Traveling in a circle around a heavenly body |
| 365 days | Time of one revolution of Earth around the sun; one orbit |
| orbit | The path around an object in space |
| tilt of the Earth | Cause of the seasons on Earth |
| summer | Earth's season when northern hemisphere tilted toward the sun |
| planets | These 9 bodies revolve around the sun |
| Earth | The third planet from the sun |
| 150 million km [93 million miles] | The distance from the Earth to the sun |
| water and oxygen | 2 things that allow life on Earth |
| sun | The medium sized star that provides Earth's light and heat |
| hot hydrogen gas | The sun is made of this |
| moon | The Earth's satellite |
| no water, no atmosphere, no life | 3 things the moon does not have |
| tides | These are caused by the gravitational pull of the moon |
| 28 days | The length of the moon's revolution and rotation |
| phases of the moon | The 8 shapes of the moon are called |
| reflected light from the sun | We see the moon because of the . . . |
| solar eclipse | Then the moon blocks out the sunlight from reaching Earth |
| lunar eclipse | When the Earth blocks out the sunlight from reaching the moon |
| Aristotle | An ancient Greek who believed the Earth was the center of the universe |
| Ptolemy | Greek astronomer who made a model of the planets and believed the sun and moon orbited Earth |
| Copernicus | Believed the Earth and planets move around the sun |
| Galileo | Italian who used a telescope and discovered moon around Jupiter |
| star | This produces its own light and heat |
| 386,000 km or 240,000 miles | Distance from Earth to the moon |
| oval or like an egg | The shape of the Earth's orbit |
| New moon, waxing crescent, first quarter, waxing Gibbous, full moon, waning Gibbous, last quarter, waning crescent | Name the 8 phases of the moon in order |
