The constellation Orion is visible on winter evenings but not on summer evenings because of
A) blockage by the full moon.
B) the tilt of Earth's rotation axis.
C) the location of Earth in its orbit around the Sun.
D) the precession of Earth's rotation axis.
C) the location of Earth in its orbit around the Sun.
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This photograph shows an interstellar bubble about 10 light-years in diameter. If you could photograph this same region about 100 years from now, how would you expect it to look different?
A) The bubble will be slightly larger. B) The bubble will be slightly smaller. C) The bubble will have burst as a supernova. D) The bubble's shape will have become much more like an oval rather than a sphere.
Photons are emitted when a bound electron jumps up to a(n) ________ energy state
A) lower B) higher C) zero D) infinite
A possible evolutionary sequence is quasar to ________ to normal spiral galaxy
Fill in the blank(s) with correct word
Boat 1 goes directly across a stream a distance L and back taking a time t1 . Boat 2 goes down stream a distance L and back taking a time t2 . If both boats had the same speed relative to the water, which of the following statements is true?
a. t2 > t1 b. t2 < t1 c. t2 = t1 d. t2 = 2t1 e. t2 = 0.5t1