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
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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.
What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?
a. The first quasars were seen to have fuzz. b. Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths. c. Quasars showed significant gravitational lens effects. d. The spectra of quasars looked like that of an M dwarf. e. The large red shifts originally indicated that they were orbiting the center of the Milky Way.
Jupiter orbits the Sun and follows which laws? Choose the best answer. I. Kepler's first II. Kepler's second III. Kepler's third IV. Newton's first V. Newton's second VI. Newton's third VII. Newton's law of gravitation
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
The greatest rift valley system yet found is ________ on Mars
Fill in the blank(s) with correct word