Across
- 4. A date when day and night are approximately equal in length
- 5. Earth’s daily spinning motion on its axis
- 11. Earth’s yearly motion around the Sun
- 12. A huge group of stars, gas, and dust held together by gravity.
- 13. A tide with the greatest tidal range, occurring at new and full Moon
- 15. The beginning of summer or winter, when daylight is longest or shortest
- 16. The point in Earth’s orbit closest to the Sun
- 17. A measure of how stretched or elliptical an orbit is
Down
- 1. The point in Earth’s orbit farthest from the Sun
- 2. The process that produces energy in the Sun and other stars
- 3. Term for the large, low-density outer planets
- 6. A tide with the smallest tidal range, occurring at quarter Moon phases
- 7. Theory stating that the universe began in a hot, dense state and has expanded
- 8. The effect that causes winds and currents to curve because Earth rotates
- 9. The spiral galaxy that contains our solar system
- 10. An event in which one celestial object blocks another or enters its shadow
- 14. Incoming solar radiation received at Earth’s surface