The traditional "top-down" hypothesis of the formation of our galaxy cannot explain
a. why not all globular clusters are the same age.
b. why the youngest globular clusters are in the outer halo.
c. why the oldest stars are metal poor but not completely metal free.
d. streams and rings of scattered stars in the halo.
e. All of the other choices are correct.
e
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The radiant is the common point from which ________ seem(s) to diverge.
A. meteorites B. asteroids C. comets D. a meteor shower
Electromagnetic waves with a wavelength of about 0.1 nm (about the size of an atom) are in which range?
A. Radio B. Microwave C. Infrared D. Visible E. Ultraviolet F. X-ray T. Gamma ray
A common pulley acts similar to a
A) hydraulic press. B) gear. C) common lever. D) tension producer.
What percentage of the surface of Venus could be characterized as continental-sized highlands?
A) less than 10% B) about 30%, like the Earth C) 45% D) 75% E) 100%