If the sun were suddenly replaced by a block hole of one solar mass, what would happen to the earth's orbit immediately after the replacement ?

Options

A. The earth would sprial into the black hole
B. The radius of the earth's orbit would be unchanged, but the period of the earth's motion would increase
C. The radius of the earth's orbnit would be unchanged, but the period of the earth's motion would decrease
D. Neither the radius of the orbit nor the period would change

Answer

B