GENERAL KNOWLEDGE

Detailed explanation-1: -Gravity is the curvature of the universe, caused by massive bodies, which determines the path that objects travel. That curvature is dynamical, moving as those objects move. In Einstein’s view of the world, gravity is the curvature of spacetime caused by massive objects.

Detailed explanation-2: -On Earth, astronauts feel the force of gravity as weight, because Earth’s surface prevents them from falling. In outer space, however, there is no ground to push against astronauts. As they orbit and fall toward Earth at the same rate as their spaceship, astronauts feel weightless, as if there were no gravity.

Detailed explanation-3: -Gravity makes Earth and other planets round. The general reason for this is fairly easy to understand: Gravity always pulls toward a center, and forces that pull toward a center tend to make objects spherical if nothing else gets in the way (Figure 3.28).

Detailed explanation-4: -As one of the four fundamental forces of nature – alongside electromagnetism and the strong and weak nuclear forces – gravity is a hugely influential natural phenomenon. It’s a property of matter, of stuff. In a nutshell: all matter is attracted to all other matter.