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

Physics & Space Science

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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

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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.

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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

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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

Physics & Space Science