What is the giant impact hypothesis for the origin of the Moon?
A) The Moon formed from material blasted out of the Earth's mantle and crust by the impact of a Mars-size object.
B) The Moon formed when two gigantic asteroids collided with one another.
C) The Moon originally was about the same size as Earth, but a giant impact blasted most of it away so that it ended up much smaller than Earth.
D) The Moon formed just like the Earth, from accretion in the solar nebula.
A) The Moon formed from material blasted out of the Earth's mantle and crust by the impact of a Mars-size object.
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In a region of space where the electric field is radial, suppose that Er = C/r3, where C is a positive constant. Is the charge density ? in this region positive, negative, or zero? (Note: ? might depend on r in this region.)
A. Positive B. Negative C. Zero D. This is impossible.
From Kepler's third law, an asteroid with an orbital period of 8 years lies at an average distance from the Sun equal to
A) 16 astronomical units. B) 4 astronomical units. C) 8 astronomical units. D) 2 astronomical units. E) It depends on the asteroid's mass.
If the central engine for our Milky Way is a black hole of 3 million solar masses, then it has an event horizon about ________ kilometers across
Fill in the blank(s) with correct word
What will be the predominant element within the Sun after it has died?
A) helium B) nitrogen C) carbon D) phosphorous