tutorial puzzle

2. Diagram graph in which the absolute magnitude of stars are plotted against their temperatures
4. huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores
10. a young star forming from a collapsing region within a molecular cloud
11. an enormous explosion that destroys a star
12. galaxy an oval shaped galaxy, made of old stars and does not have much gas or dust
14. star a star with a large radius for its mass and temperature, resulting in high brightness
16. an attractive force that exists between all objects that have mass
17. sequence star a band of stars on a Hertzsprung-Russell (HR) diagram that represents the stages a star goes through during most of its life
20. nebula a region of cosmic gas and dust formed from the cast off outer layers of a dying star
21. Way Galaxy the spiral galaxy of which the Sun and the solar system are a part.

1. all of space and everything in it including stars, planets, and galaxies
3. large cloud of gas and dust that contracts under gravitational force and breaks apart into smaller pieces, each of which will collapse to form a star
4. galaxy a galaxy exhibiting a central nucleus from which extend curved arms of higher luminosity
5. shift the shift to a different wavelength
6. galaxy a galaxy with no identifiable shape or structure, mostly made of young stars.
7. the path an object follows as it moves around another object
8. dwarf what stars like the sun become after they have exhausted their nuclear fuel
9. system the Sun together with the group of celestial bodies that are held by its attraction and revolve around it
13. background radiation leftover energy from the Big Bang
15. year distance light travels in a year
16. a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity
18. matter an invisible form of matter that does not emit any detectable electromagnetic energy of its own
19. energy an invisible form of energy that creates a repulsive force causing the universe to expand