When a massive star dies, a dense remnant core is left and forms into a black hole. It contains a large amount of matter - nearly ten times mass of the Sun, concentrated in a small diameter of a sphere. Thus, the space-time curvatures change, and the gravitation pull becomes infinitely strong.
At 400 kilometers above the earth’s surface, the International Space Station (ISS) is orbiting the earth at the high speed of 7.6 km/s in outer space.
The earth also rotates on its axis and revolves around the sun, like other planets. Currently, the earth rotates at a high speed of 1,000 miles per hour. Despite this, we don't feel anything, means, it doesn't affect us. But, even a slight change in the rotation speed would affect us.