Explain what types of information can be obtained from a spectral line
What will be an ideal response?
The element which created it, the line-of-sight velocity of the source, its rotation speed, temperature, the pressure of the gas emitting the radiation, and even its magnetic field may also be found.
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Some gamma-ray bursts last only a few seconds and do not appear to come from supernovae. What is the leading hypothesis for the origin of short these gamma-ray bursts?
A) new stars forming in the Milky Way B) bursts of fusion occurring on the surfaces of white dwarfs in binary systems C) bursts of fusion occurring on the surfaces of neutron stars in binary systems D) The explosion of a white dwarf E) The mergers of two neutron stars
If there is a first-quarter moon visible from Paris one evening, six hours later in New York there will be full moon visible.
Answer the following statement true (T) or false (F)
What type of forces result in normal faulting?
a. Shear b. Compressional c. Expansive d. Parallel
The date is September 21 and the Moon is at full
phase. An observer who sees this moon on her overhead meridian at this time a) sees the Sun setting. b) sees the Sun rising. c) cannot see the Sun. d) sees the Sun overhead.