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

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