What observational evidence supports the conclusion that most of the mass of the Milky Way is in the form of dark matter?
A) There is no observational evidence; it is only a theoretical idea based on computer models indicating that the Milky Way could not have formed unless it had much more mass than it contains in stars and gas.
B) Although dark matter emits no visible light, we have detected it with radio telescopes.
C) We can see the dark matter as dark blotches in the sky, such as the dark lanes that are visible within the Milky Way in the night sky.
D) The orbital speeds of stars and gas clouds far from the galactic center are surprisingly high, suggesting that these stars and gas clouds are feeling gravitational effects from unseen matter.
D) The orbital speeds of stars and gas clouds far from the galactic center are surprisingly high, suggesting that these stars and gas clouds are feeling gravitational effects from unseen matter.
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According to our theory of solar system formation, what are asteroids and comets?
A) the shattered remains of collisions between planets B) chunks of rock or ice that condensed after the planets and moons finished forming C) chunks of rock or ice that were expelled from planets by volcanoes D) leftover planetesimals that never accreted into planets
The lower limit for a main sequence star is _______________ solar masses
Fill in the blank(s) with correct word
For every star with a mass greater than 10 solar masses, about how many stars are there with masses less than a solar mass?
A) 1 B) 3 C) 10 D) 30 E) 200
What forces cause the Earth to assume the shape of an oblate ellipsoid?
What will be an ideal response?