The Stars

7. The ______ of distant objects can be approximated based on the intensity of light they emit
8. Nuclear ____ occurs in the core of the sun where the temperature exceeds 15,000,000C
9. The most abundant element in our Sun and its main fuel source
11. These occur from the deaths of massive stars where the core is greater than 3.0x the mass of our sun
12. Colder stars are ____ in color
15. Kelvin is an _____ temperature scale, meaning it can never be a negative number
16. These types of stars remain when the core of a star is compressed to about the size of NYC, or 20km across
17. The ______ of a star can be determined based off the bands on an emission or absorption spectrum
18. Hotter stars are ____ in color

1. These stars are the smallest and hottest stars with low luminosity due to their size
2. Stellar _____ was devised by astronomers at Harvard, with Annie Jump Cannon personally inspecting and classifying over 250,000 stars
3. This type of spectrum is sent out by some source
4. The most energetic occurrence in the universe when the core of a star explodes
5. This element is the death signal for stars
6. As objects get _______, they emit more and more light - they glow brighter
10. These stars are late-stage main sequence stars and are the beginning of the end of normal sized stars
13. There are three types of _______, continuous, absorption, and emission
14. The outer layer of the Sun or a star where sunspots occur