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1. process by which protons in stars bypass the Coulomb barrier and fuse
3. "Heavy hydrogen" (1 proton and 1 neutron)
5. The name of the method to detect exoplanets based on small dips in the stellar light curve
7. Stars on the horizontal branch burn this element in their cores
10. The acronym for the first detector to measure gravitational waves
12. This poorly named type of nebula is formed when medium-mass stars are about to end their life
13. name for the colorful interaction between the solar wind and Earth's magnetic field
14. The name of the NASA mission that discovered many exoplanets between Earth and Neptune in size
16. The width of spectral lines is used to measure this property of stars
17. The full spectral class sequence from hot to cold (no spaces)
19. A low-density region in the universe large scale structure
20. This is a spherical component of the Milky Way consisting of really old stars
21. This is a type of dwarf galaxy somewhat similar to an elliptical but more diffuse
22. The densest areas in molecular clouds in which stars are directly born
23. This type of supernova is responsible for long-duration gamma ray bursts
24. spectral and luminosity class of the Sun (no spaces)

2. This principle states that free fall is indistinguishable from zero gravity (deep space)
4. A special name of protostars with a disk and no envelope (no spaces)
6. This type of particle is the main contributor to the explosion of a massive star
8. This type of binary star is observed as two sets of spectral lines
9. class of particles with spin with 1/2 in it (1/2, 3/2, 5/2, etc.)
11. A rectangular region at the center of the Milky Way
15. This object is a rapidly rotating neutron star
18. This type of cluster is very dense and filled with really old stars
21. blurring of objects in telescopes on Earth due to atmospheric turbulence