What evidence suggests that long gamma ray bursts originate from supernovae of stars massive enough to form black holes?
A) Some gamma ray bursts have been found to originate with galaxies that are actively forming stars, and would thus have a few very massive (but short lived) stars.
B) Rapid observations in other wavelengths show that some gamma ray bursts coincide with points showing typical supernova light curves.
C) The locations of gamma ray bursts suddenly begin blocking light from more distant stars.
D) A and B
E) B and C
D
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During a total solar eclipse, what part of the Sun is often visible that we normally cannot see?
a. core b. CMEs c. corona d. photosphere e. solar wind
Give two reasons why summer days are warmer than winter days
What will be an ideal response?
The oxygen in Earth's atmosphere
a. was manufactured inside stars. b. was added to the atmosphere by plant life. c. has grown more abundant since the origin of Earth. d. was manufactured inside stars, was added to the atmosphere by plant life, and has grown more abundant since the origin of Earth. e. None of the other choices are correct.
Which of the following is not one of the most common nonsilicate groups of minerals?
a. Sulfides b. Oxides c. Chlorides d. Carbonates