23.18: Beyond the Solar System- Challenge 3

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1. The closest galaxy to ours is the ___.: Andromeda Galaxy

2. A ___ galaxy has pinwheel-like arms and rotates around a central bulge.: spiral

3. The three types of galaxies are ___.: spiral, elliptical, and irregular

4. Our solar system is located ___.: within one of the spiral arms of the Milky Way

5. The ___ of the Milky Way contains the oldest stars.: halo

6. There is a ___ in the center of the Milky Way.: black hole

7. Redshift is ___.: the phenomenon in which absorption bands are shifted towards the red end of the spectrum

8. According to the Doppler Effect, ___.: as waves moves closer to you, the waves pack closer together, and vice versa

9. Hubble's Law states that ___.: the farther away a galaxy is, the faster it is moving away from us

10. ___ and ___ are the most abundant gases in the universe.: Hydrogen; helium

11. During the immediate aftermath of the Big Bang, hydrogen nuclei collided and fused into ___ nuclei.: helium

12. According to the Big Bang Theory, the universe formed ___ years ago.: 13.7 billion