Gravitational lensing of distant, faint irregular galaxies may be the key to
A) understanding galactic rotation curves.
B) understanding active galactic nuclei.
C) quasar energy production.
D) mapping dark matter.
E) determining galactic redshifts.
D
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What do astronomers mean by a constellation?
A) A constellation is a region in the sky as seen from Earth. B) A constellation is a group of stars related through an ancient story. C) A constellation is any random grouping of stars in the sky. D) A constellation is a group of stars that are all located in about the same place in space.
Blue stragglers are only found in ________
Fill in the blank(s) with correct word
Quantum tunneling occurs in
a. nuclear fusion. b. radioactive decay by emission of alpha particles. c. the scanning tunneling microscope. d. all of the above. e. only (b) and (c) above.
X-rays from astronomical objects can only be detected from telescopes in space
Indicate whether the statement is true or false