Approximately how long does it take the Sun to orbit the center of the Milky Way Galaxy?
A) 200 million years
B) 200,000 years
C) 20,000 years
D) 2 billion years
E) 2 million years
A
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If the enter full moon passes through the earths umbra, we will see
a)partial solar eclipse b)penumbral lunar eclipse c) total lunar eclipse d) annular eclipse
The major source of CO pollution is
a. combustion for electrical generation. b. industry. c. domestic heating. d. transportation.
Metals are shiny because
A) they reflect 100% of incident light. B) they are poor absorbers of light. C) their electrons vibrate to the oscillations of any incident light. D) none of the above
How can astronomers measure the composition of an extrasolar planet's atmosphere?
A) by measuring how brightly the planet glows in infrared light B) by measuring the Doppler shift of the host star C) by comparing spectra for when the planet is in transit or eclipse with spectra taken at other times D) by measuring the composition of the host star; the planet must have formed from the same initial material