Across
- 3. the stage after main sequence for a small to medium mass star; fuel begins to run out
- 6. an extremely bright explosion of a star
- 8. No reflected light from the sun is visible
- 9. Occurs directly after a third/last quarter, but before a new moon
- 10. Occurs directly after a new moon, but before a first quarter
- 11. A full moon is fully visible (100% illuminated) as viewed from Earth
- 15. Occurs directly after a first quarter, but before a full moon
- 16. a star that is among the most massive and brightest of all stars
- 17. a young star in the early stages of formation; nuclear fusion begins (light and heat produced)
- 18. 90% of stars are in this stage of their life cycle
Down
- 1. Occurs directly after a waning gibbous, but before a waning crescent
- 2. a star that has exhausted all of its nuclear fuel; planet sized and very dense
- 4. a dead star that no longer gives off light or heat
- 5. a gravitational field so strong that not even light can escape
- 7. a ring-shaped nebula formed by an expanding shell of gas around an aging star
- 8. the extremely dense remains of a dead star; very small and very dense
- 9. Occurs directly after a full moon, but before a third/last quarter
- 12. a huge cloud of dust and gas held together by gravity; star nursery
- 13. Occurs directly after a waxing crescent, but before a waxing gibbous
- 14. the distance light travels in a year – about 5.88 trillion miles