Before turning into a white dwarf, a star like the Sun will spend most of its life as a main sequence star.
Answer the following statement true (T) or false (F)
True
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The value of an object's gravitational potential energy depends on the ______________
Fill in the blank(s) with correct word
The magnetic pole near the Earth's north geographic pole actually has to be
A. either an N or an S pole, but scientists have not determined which one yet. B. an S pole, because it attracts the N pole of your compass needle. C. an N pole because it repels the S pole of your compass needle.
Meteor showers are
A) usually annual events, as the orbits again intersect. B) caused by the Earth passing near the orbit of an Earthgrazing asteroid. C) caused by the Earth passing near the orbit of an old short-period comet. D) Both A and B are correct. E) Both A and C are correct.
Suppose you are observing a distant galaxy whose light has taken 12 billion years to reach us. What is the maximum age that this galaxy could have been when it emitted the light we are observing now? (Assume the age of the universe is about 14 billion years.)
A) about 2 billion years old B) about 10 billion years old C) about 4 billion years old D) about 12 billion years old