Approximately what core temperature is required before hydrogen fusion can begin in a star?
A) 10,000 K
B) 10 million K
C) 1 billion K
D) 10 billion K
E) 10 trillion K
B
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When was the first confirmed exoplanet discovered?
A) Shortly after the invention of the telescope, in the early 1600s B) In prehistoric times C) Around 350 BC, by the Ancient Greeks D) Early in the 21st century E) Near the end of the 20th century
The main source of energy for a star as it grows in size to become a red giant is
A) hydrogen fusion in the central core. B) helium fusion in the central core. C) hydrogen fusion in a shell surrounding the central core. D) gravitational contraction.
The type of nuclear reactor used in the United States was originally developed
A) during the Manhattan project. B) in Canada. C) as part of the H-bomb program. D) by private industry. E) for submarines.
The presence of granulation is clear evidence that energy is flowing upward through the photosphere by a process known as__________
A) convection B) ionization C) blueshift D) polarization