It is expected that only elliptical galaxies have a massive black hole at their center.
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Q68: Astronomers believe that dark matter exists because.
A)
Q69: What is a gravitational lens?
A) a star
Q70: Why is it difficult to use the
Q71: Why do galaxy collisions lead to star
Q72: The apparent shape of an elliptical galaxy
Q74: The Hubble law does not apply for
Q75: Irregular galaxies, although small in size, have
Q76: When viewed through a small telescope, galaxies
Q77: The NGC (New General Catalog) is a
Q78: Edwin Hubble was the first to classify
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