Across
- 4. the moment when a celestial object crosses the meridian and is thus at its highest above the horizon.
- 7. the point in the sky that’s directly overhead.
- 8. object an entry in a catalog of 103-star clusters, nebulas, and galaxies
- 10. the distance that light travels in one year.
- 11. the line on the Moon or a planet that divides the bright, sunlit part from the part in shadow.
- 12. the brightness on the moon gets bigger.
Down
- 1. timetable with celestial coordinates that indicate where a planet, comet, or other body moving in relation to background stars will be in the sky.
- 2. a device that can be adjusted to show the appearance of the night sky for any time and date on a round star map
- 3. avast collection of stars, gas, and dust, typically 10,000 to 100,000 light-years in diameter and containing billions of stars.
- 5. great clouds of glowing gas, lit up by stars inside or nearby.
- 6. Time the measure of time by the stars.
- 9. the measure of how much an orbit deviates from being circular.