This graph shows data collected by a gamma ray telescope. What kind of event is it showing?
A) a gamma ray burst from a distant galaxy
B) a burst of gamma rays from a flare on a blue supergiant star
C) a burst of gamma rays from an explosion on the surface of a neutron star
D) the on and off gamma-ray light changes of a pulsar
A) a gamma ray burst from a distant galaxy
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Maria are light-colored mountainous lunar highlands
Indicate whether the statement is true or false
Compared to a chemical rocket, an ion engine has a
A) smaller thrust but can be operated for a longer time period B) smaller thrust and can only be operated for a shorter time period C) larger thrust and can be operated for a longer time period D) larger thrust but can only be operated for a shorter time period
An amount of a monatomic ideal gas is taken around the process shown. The amount of heat extracted during process B-C is:
1.10 J
2.20 J
3.15 J
4.45 J
5.60 J
6.none of the above
7.cannot be determined
The type of mirror that will allow you to see large areas normally hidden from your view is __________
Fill in the blank(s) with correct word