Across
- 2. Large round pits.
- 5. The amount of matter in an object.
- 8. Chunks of rock or dust from space.
- 12. An object that orbits the sun, is large enough to have become rounded by its own gravity and has clear the area of its orbit.
- 14. The movement of one object around another.
- 16. The tendency of an object to resist a change in motion.
- 17. A force that attracts all objects toward each other.
- 20. The rise and fall of the oceans water that occurs every 12.5 hours or so.
- 21. Occurs at a full moon when Earth is directly between the moon and the sun.
- 22. A body that orbits a planet.
- 23. When an object in space comes between the sun and a third object, casting a shadow on that object.
- 26. The measure of the force of gravity on an object.
- 28. A giant ball of hot gas, mainly composed of hydrogen and helium.
Down
- 1. Earth's path around the sun which is slightly elongated.
- 3. The imaginary line that passes through Earth's center and the North and South poles.
- 4. Dark, flat areas of hardened rock formed from huge lava flows that occurred 3-4 billion years ago.
- 6. The very darkest part of the moon's shadow that strikes Earth.
- 7. The sun's pull is at right angles to the moon's pull - producing a tide that is the least difference between consecutive low and high tides.
- 9. Occurs when the moon passes directly between Earth and the sun, blocking sunlight from Earth.
- 10. The noon sun is directly overheard at the equator. Means equal night. Day and night are about 12 hours each.
- 11. A long cold mixture of dust and ice that gives up a long trail of light as it approaches the sun.
- 13. The spinning of Earth on its axis. Causes day and night.
- 15. A streak of light produced when a small object burns up entering Earth's atmosphere.
- 18. A pattern or group of stars that people imagined to represent a figure, animal or object.
- 19. The sun appears farthest north of the equator once each year and farthest south once each year. Aligns with shortest and longest day of the year.
- 22. The combined forces of the sun and moon produces a tide with a greatest difference between consecutive low and high tides.
- 24. The different shapes of the moon seen from Earth - caused by the motions of the moon around Earth.
- 25. The less dark, larger part of the moon's shadow that strikes Earth.
- 27. A system of organizing time that defines the beginning, length and divisions of a year.