Large molecular clouds will form into protostars because of ____
a. the thermal motions of the atoms in the gas cloud
b. gravitational contraction
c. radiation pressure from nearby stars
d. the temperature reaching a critical point
e. condensation of dust and gas
b
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________ are hot compact remnant stars whose mass is typically between one and several times that of the Sun, but their size is only 10 km or less.
A. Neutron stars B. White dwarfs C. Pulsars D. Black dwarfs
An annular eclipse
A. occurs when the Moon's shadow does not completely reach Earth during a solar eclipse. B. occurs when Earth's shadow does not completely reach the Moon during a lunar eclipse. C. is a lunar eclipse that happens every November. D. is a solar eclipse that happens every November.
When looking for the "Doppler Wobble" (radial velocity changes detected due to Doppler shifts), which mass combination is most likely to be detected?
A) High mass star, high mass planet B) High mass star, low mass planet C) Low mass star, high mass planet D) Low mass star, low mass planet E) A high mass planet; the mass of the star is irrelevant.
Spherical Mirrors: The focal length of a convex mirror is has a magnitude of 20 cm. What is its radius of curvature?
A. -10 cm B. 40 cm C. -40 cm D. -20 cm E. 20 cm