The major problem faced by optical astronomers in trying to deduce the structure of the Milky Way Galaxy is that we can see only a small part of it because of the ________
Fill in the blank(s) with correct word
interstellar dust
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The most likely method of interstellar communication is similar to which type of communication on Earth?
A) sign language B) telepathy C) Morse code D) the spoken word
The standard unit of time is the
a. hour. b. day. c. second. d. minute.
If in the absence of external forces, a rotating ball of hot gas cools and contracts, its rate of rotation
1) decreases 2) remains essentially the same 3) increases and its angular momentum 4) decreases. 5) remains essentially the same. 6) increases.
Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Linear momentum
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved. d. none of the above