You want to find a mass of a star on the main sequence of the H-R diagram. What do you need?
a. The star has to be in a visual binary. b. The star has to be in a spectroscopic binary.
c. You need the star's luminosity. d. You need the star's absorption spectra.
c
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The air on Mars is 95% nitrogen and argon
a. True b. False Indicate whether the statement is true or false
Which of the following celestial objects do not rise in the east and set in the west? (Assume that all of these objects are visible from your location on Earth, and that none of them are circumpolar.)
A) stars B) the Sun C) the Moon D) galaxies E) All of these objects rise in the east and set in the west.
Name each of the factors in the Drake equation
What will be an ideal response?
Whether one object is warmer than another object has most to do with molecular
A) kinetic energy. B) potential energy. C) masses.