When galaxies collide, the large-scale galactic structure is affected, but most of the individual stars are not
Indicate whether the statement is true or false
TRUE
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This photo shows the central region of a cluster of galaxies. Based on what you have learned from your text, which of the following statements about this photo is not true?
A) The oldest stars in these galaxies are much older than the oldest stars in our own Milky Way. B) Half for more of the large galaxies we see in this photo are elliptical galaxies. C) Many of the galaxies in this photo have probably suffered collisions in the past. D) These galaxies are held together by their mutual gravitational attraction.
Gravity is an attractive force between
A. all objects everywhere B. Earth and objects on Earth C. Earth and Moon, and objects on Earth D. all massive objects
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What will be an ideal response?
All the following statements about known extrasolar planets are true. Which one came as a surprise to scientists who expected other solar systems to be like ours?
A) Some of the planets orbit their star more closely than Mercury orbits the Sun. B) Most of the planets are quite massive—much more like Jupiter than like Earth. C) Most of the planets orbit stars that are quite nearby compared to the scale of the entire Milky Way Galaxy. D) In some cases, we've found more than one planet orbiting the same star.