The energy of a photon of wavelength 400 nm is _____________.
a. 
b. 
c. 
d. 
e. 
e.
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The geologic time scale is broken up into time units of different sizes based on eons, eras, periods, and epochs.
Indicate whether the statement is true or false
The Solar System is located about ________ from the center of the Milky Way.
A. 8 light-years B. 8 kiloparsecs C. 8 parsecs D. 8 AU
The Early Bird communication satellite hovers over the same point on Earth's equator indefinitely, because
A) other forces than Earth's gravity act on it. B) it pulls as hard on Earth as Earth pulls on it. C) it is beyond the main pull of Earth gravity. D) it is kept aloft by ground control. E) its orbital period is 24 hours.
What direct evidence do astronomers have that supports the heavy element formation in stars?
A) The presence of technetium in giant star spectra B) Observed elemental abundances C) Gamma-ray emissions from decay of cobalt 56 in supernovae D) Light curves of type-I supernovae E) All of the above are evidence of this.