We can calculate the mass of the part of the Galaxy that is closer to the center than the Sun by using...
A) Copernicus's rules for the revolution of objects.
B) Kepler's third law as he wrote it.
C) Kepler's third law as Newton revised it.D) All of the above
Interstellar clouds require a triggering mechanism to cause them to develop into protostars.
Open clusters are sometimes called galactic clusters because
A) they are found in the Milky Way Galaxy.
B) they are in the plane of the Galaxy.
C) they are often shaped like small galaxies.D) they are found between galaxies.
In Hubble's tuning fork diagram galaxies are classified according to
A) Their shapes
B) their velocities relative to the Milky Way
C) their masses
D) their sizesE) All of the above
The Milky Way Galaxy has the shape of a...
A) sphere, like a basketball.
B) oval, like a football.
C) round disk (like a pancake) with a ball at its center.D) elongated disk, like a flattened football
The local group of galaxies and the Virgo cluster are members of the same supercluster of galaxies.
A) TrueB) False
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