In the context of understanding stellar lives, "high-mass" stars have masses
A) more than about 8 times the mass of our Sun.
B) more than about 3 times the mass of our Sun.
C) more than twice the mass of our Sun.
D) more than 20 times the mass of our Sun.
A
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An M star is hotter than an O star
Indicate whether the statement is true or false
By observing gas clouds orbiting the centers of galaxies, we have learned that galaxies are made mostly of dark matter. In these observations
A) the light from the gas clouds is obscured by some unseen material. B) the low speeds of the gas clouds show that they are being slowed by some unseen material. C) the high speeds of the gas clouds show that they are being pushed by some unseen material. D) the low speeds of the gas clouds show that they are gravitationally attracted to the center by unseen material. E) the high speeds of the gas clouds show that they are gravitationally attracted to the center by unseen material.
The direction of vibration for an electron and the plane of polarization of the light it emits
A) are the same. B) are at right angles to each other. C) may or may not be at right angles to each other. D) are independent of each other.
When measuring air temperature, it is best to avoid
a. shade. b. shadows. c. direct sunlight. d. none of these.