A star spends most of its life
A: As a Main Sequence star
B: As a protostar
C: In explosions lasting millions of years
D: As a red giant or supergiant
E: Burning Carbon to Oxygen
Ans: A: As a Main Sequence star
You might also like to view...
Suppose that we have two containers, one holding N molecules of helium gas, and one holding N/2 molecules of oxygen gas. Both are initially at room temperature. We then add the same amount of energy to each gas. Which is hotter at the end?
A. The helium B. The oxygen C. Both have about the same temperature. D. One cannot say without measuring.
Which statement accurately describes how our Sun fits into the mass range of stars?
A) The Sun is completely average, with half of all stars being more massive than the Sun and half of all stars being less massive than the Sun. B) The Sun is near the bottom of the overall mass range. C) The Sun is near the top of the overall mass range. D) The Sun is near the middle of the overall mass range, but most stars are more massive than the Sun. E) The Sun is near the middle of the overall mass range, but most stars are less massive than the Sun.
What evidence do astronomers have that the Universe is expanding?
A. There is a measurable redshift in the spectral lines of distant galaxies. B. Galaxies disappear when they pass the cosmic horizon. C. The disks of galaxies are getting smaller over time. D. Nearby clusters of galaxies are smaller than more distant ones. E. Distant galaxies are dispersing, pulled apart by the expansion of space.
A container is filled with water and the pressure at the container bottom is P. If the container is instead filled with oil having specific gravity 0.80, what new bottom pressure results?
a. a pressure < P b. the same pressure P c. a pressure > P d. This is unable to be determined with the information given.