Across
- 3. The average distance between Earth and the Sun (approx. 93 million miles).
- 7. The cloud of gas and dust from which our solar system formed.
- 8. A region of space having a gravitational field so intense that no matter or radiation can escape.
- 11. One complete orbit of a planet around the sun (defines a "year").
- 12. The region of interplanetary space between Mars and Jupiter where most asteroids are found.
- 14. Year The distance light travels in one year (approx. 9.46 trillion km).
- 15. The shape of the directly sunlit portion of the Moon as viewed from Earth.
Down
- 1. The curved path of a celestial object around a star, planet, or moon.
- 2. The leading explanation for how the universe began.
- 4. An event in which the shadow of one celestial body falls on another.
- 5. A celestial object consisting of a nucleus of ice and dust that leaves a "tail" when near the sun.
- 6. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
- 9. Tilt The angle between an object's rotational axis and its orbital axis (causes seasons on Earth).
- 10. The spinning of a planet on its axis (defines a "day").
- 13. The rise and fall of sea levels