The observation that outer parts of galaxies rotate faster than the observable mass within their orbit can pull them implies that ________.
A. in time, galaxies will develop spiral arms
B. the masses of galaxies are larger than their luminous mass
C. all galaxies will eventually develop a bulge
D. galaxies are unstable
E. None of these choices is correct.
Answer: B
Physics & Space Science
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White dwarfs like Sirius B are typically the size of ________
Fill in the blank(s) with correct word
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The lunar regolith is constantly eroded by ________
Fill in the blank(s) with correct word
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If the Galactic Year is defined as the orbital period of the solar system, how long does it take us to circle the center? How do we know?
What will be an ideal response?
Physics & Space Science
Which source generates the most energy over its lifetime?
A) A supernova. B) A gamma-ray burst. C) A quasar. D) The Sun. E) A camp fire.
Physics & Space Science