The universe we live in now is said to be ________ dominated
A) hydrogen B) matter C) dark matter D) dark energy E) radiation
D
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A mixture of light and heavy molecules make up a sample of gas. If the temperature of the gas is constant, then all the molecules have the same average
A) speed. B) kinetic energy. C) both of these D) none of the above
Whether the universe is open, closed or flat depends on the ____ of the universe
a. luminosity b. density c. temperature d. radius e. rotation rate
Looking through your telescope tonight, you observe a distant galaxy called RXJ1800 and notice that it is very near in the sky to the bright star Vega. What can you conclude from this observation?
A) RXJ1800 and Vega will both set in the west at about the same time. B) Vega orbits the center of mass of RXJ1800. C) Vega and RXJ1800 must be no more than a few light-years apart. D) If you observe them again in a few nights, RXJ1800 and Vega will be farther apart than they appear tonight.
On average, how fast do the plates move on the Earth?
A) a few centimeters per year B) a few millimeters per century C) about 1 mile per hour D) a few kilometers per year