The bending of distant starlight by a closer object, resulting in a temporary brightening of the star, is called ________
Fill in the blank(s) with correct word
gravitational lensing
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Tycho Brahe's contribution to astronomy included:
a. Tycho Brahe's contribution to astronomy included: b. inventing the telescope. c. proving that Earth orbits the Sun. d. collecting data that enabled Kepler to discover the laws of planetary motion.
How far does a beam of light travel through space in one 365-day year? (c = 3.0 × 108 m/s)
A) 30 × 108 m B) 36 × 1016 m C) 95 × 1014 m D) 80 × 1012 m E) 20 × 1015 m
The brakes of a speeding truck are slammed on and it skids to a stop. If the truck were heavily loaded so that it had twice the total mass, the skidding distance would be
A) half as far. B) 1.5 times as far. C) twice as far. D) 4 times as far. E) the same.
Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into the galaxy's disk?
A) WIMPs are light enough that they have expanded out into the halo. B) Shock waves from generations of supernovae have blown the WIMPs out into the halo. C) WIMPs annihilate when they come into contact with ordinary matter, such as stars. D) WIMPS cannot produce photons, therefore they rarely interact and exchange energy with other particles. E) WIMPs were produced in the early stages of galaxy evolution, and objects in the halo, such as globular clusters, were formed first.