If the Sun were replaced by a one solar mass black hole:

Question

Quizplus · Accepted Answer

The gravitational force that the black hole would exert on Earth would be the same as the force that the Sun exerts on Earth, so the Earth would continue to orbit it at the same distance and in the same period of one year. The Earth would still orbit the black hole in a period of one year, as the gravitational force on the Earth would remain the same as when it orbited the Sun. The other options are not accurate; A is incorrect as the terrestrial planets would not immediately fall into the black hole but would continue to orbit it, just as they orbit the Sun; C is incorrect as the radiation from the black hole would be no different from the radiation from the Sun, and would not drive the Earth out of the solar system; D is incorrect as clocks on Earth would continue to function normally; E is also incorrect, as the replacement of the Sun with a black hole would likely have significant effects on life on Earth due to changes in the amount of heat and light received from the black hole versus the Sun.

If the Sun Were Replaced by a One Solar Mass