Black holes, by definition, cannot be observed directly. What observational evidence do scientists have of their existence?

A) Theoretical models predict their existence.
B) Gravitational interaction with other objects.
C) Space is, overall, very black.
D) We have sent spacecraft to nearby black holes.
E) We have detected neutrinos from them.


B

Physics & Space Science

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a. I, II, III, V, VI b. II, IV, VI, VII c. I, II, III, IV, V, VII d. I, II, IV, V, VI, VII

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The theory that Mercury shrank slightly when it was young has been proposed to explain

a. extended lava plains. b. large craters. c. magnetic field. d. lobate scarps. e. regolith.

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What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?

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The greatest rift valley system yet found is ________ on Mars

Fill in the blank(s) with correct word

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