Solar-type stars in our galaxy are
A) very common, making up about 50% of the total
B) very rare (less than 1%)
C) fairly common (several percent)
D) the most common type of stars in our galaxy (75% or more)
C
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A planet's density can be determined if it is observed to periodically transit in front of its parent star causing eclipses
Indicate whether the statement is true or false
What evidence supports the existence of a black hole at the center of our galaxy?
A) The motions of the gas and stars at the center indicate that it contains 4 million solar masses within a region only 3 light-years across. B) We observe a large, dark object that absorbs all light at the center of our galaxy. C) We can see gas falling into an accretion disk and past the event horizon of a black hole. D) We observe an extremely bright X-ray source at the center of our galaxy. E) All of the above
When a freely falling object reaches its terminal speed,
a. it is still accelerating. b. its acceleration is zero. c. it is decelerating. d. its acceleration cannot be determined.
Which of the following is not a fundamental force of nature?
a. strong nuclear force b. electroweak force c. weak nuclear force d. electromagnetic interaction