What is proper motion?
A) It is the true, not apparent, motion of a star in space.
B) It is the apparent shift as we go to opposite sides of our orbit every six months.
C) It is the annual apparent motion of a star across the sky.
D) It is the motion of a star towards or away from us, revealed by Doppler shifts.
E) It is the orbital motion of a star around the Galaxy.
C
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Answer the following statement(s) true (T) or false (F)
1. Consider a uniformly charged circular loop and a uniformly charged straight wire. These two charge distributions create very different electric fields in the empty space that surrounds them. Even so, the divergence a distance r from the center of the loop along its axis and the divergence the same distance r from the wire’s center have the same numerical value.
How many "generations" of electroweak particles are there?
A) three B) two C) four D) six E) an infinite number
What are the eight major plates according to the theory of plate tectonics?
What will be an ideal response?
The Sun's life time is 10 billion years. About how long is the lifetime of a star with a star has a mass of 10 MSun and a luminosity of 10,000 LSun?
A) 1 million years B) 100 billion years C) 100 trillion years D) 10 million years