At the longest look-back times, we see ____
a. redshifted irregular galaxies
b. redshifted dwarf elliptical galaxies
c. redshifted dwarf spiral galaxies
d. blueshifted dwarf spiral galaxies
e. blueshifted dwarf elliptical galaxies
a
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Heat death refers to the universe
A) reaching the lowest energy state possible, which will mean the greatest level of entropy. B) ending after a massive fire. C) reaching a state where all stars expand and merge into each other. D) reaching the point where the process of radioactive decay is no longer possible.
The apparent visual magnitude of a star is 7.3 . This tells us that the star is
a. one of the brighter stars in the sky. b. bright enough that it would be visible even during the day. c. not visible with the unaided eye. d. very far from Earth. e. very close to Earth.
The two great theories of 20th-century physics are
A) high energy physics and the theory of relativity. B) thermodynamics and electromagnetism. C) electromagnetism and the theory of relativity. D) quantum theory and electromagnetism. E) the theory of relativity and quantum theory.
A sonic boom occurs:
a. exactly when an object breaks the sound barrier. b. just before an object breaks the sound barrier. c. immediately after an object breaks the sound barrier. d. when an object slows down to less than the speed of sound. e. when the edge of the shock wave reaches a listening ear.