If there were no greenhouse effect, Earth would
a. be warmer than it is today.
b. have a thicker atmosphere.
c. be colder than freezing.
d. have no protection from ultraviolet radiation.
Answer : c. be colder than freezing.
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Two stars have the same luminosity. Star X is spectral type F, while Star Y is spectral type K. Therefore, Star X is larger in radius than Star Y
Indicate whether the statement is true or false
In the process of planetary formation, when would the inward migration of Jupiters have been most likely?
A) Shortly after all of the planets had finished forming B) Just after the system was cleared of the remaining gas C) Before these planets had grown to full size D) After these planets had reached full size, but before terrestrial planets had finished forming E) At least hundreds of millions of years after planetary formation ended
Virtually all the carbon-rich dust in the plane of the galaxy originated in:
A) low-mass stars. B) high-mass stars. C) planetary nebulae. D) white dwarfs. E) brown dwarfs.
The visible surface of the Sun is called the
a)chromosphere. b)photosphere. c)corona. d)celestial sphere. ?