How can astronomers currently determine the temperature of an extrasolar planet?
A) estimate the temperature based on the planet's distance from the star
B) measure the drop in total infrared light when the planet passes behind the star from our perspective
C) use spectroscopy of the planet to identify the wavelength at which its emission peaks
D) A and B
E) B and C
D
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An object that has zero resistance is a __________
Fill in the blank(s) with correct word
Sediments deposited in an even, horizontal manner illustrate the principle of
A) superposition. B) original horizontality. C) succession. D) conformity.
Tidal forces are very important to the Algol system today, but were not important when both stars were still on the main sequence. Why not?
A) Main-sequence stars in a system like the Algol system are small compared to their physical separation. B) Main-sequence stars are too big to be affected by tidal forces. C) Main-sequence stars are too massive to be affected by tidal forces. D) Main-sequence stars are unaffected by tidally-induced mass transfer.
Earth circles the Sun in _____
A) 365.26 days B) 363.25 days C) 366.75 days D) 364.26 days