Which star has the highest density (mass per unit volume)?
a. white dwarf
b. main sequence
c. supergiant
d. red giant
e. regular giant
a
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A cold, irregularly shaped region in the interstellar medium that diminishes or completelyobscures the light from background stars is called a//an:
a) irregular galaxy b) dark dust cloud c) emission nebula d) reflection nebula e) planetary nebula
One of the "nails in the coffin" for Earth-centered universe was
A) the retrograde motion of the planets. B) the phases of the Moon. C) eclipses of the Sun. D) Galileo's observation of stars in the Milky Way. E) Galileo's observations of the moons of Jupiter.
Chemically, clean [nonpolluted] air is
A) an isotope. B) a mixture of different compounds. C) an element. D) a compound. E) a liquid.
The length of a spaceship is 14 m when it is at rest. If the spaceship travels by you with a speed of 0.80c, what length does it appear to you?
A) 6.3 m B) 8.4 m C) 18 m D) 20 m E) 22 m