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The answer is gravity: an invisible force that pulls objects toward each other. Earth's gravity is what keeps you on the ground and what makes things fall. An animation of gravity at work. Albert Einstein described gravity as a curve in space that wraps around an object—such as a star or a planet.
What Is Gravity? Gravity is the force by which a planet or other body draws objects toward its center. What Is a Black Hole?
Gravitational waves travel at the speed of light (186,000 miles per second). These waves squeeze and stretch anything in their path as they pass by. A gravitational wave is an invisible (yet incredibly fast) ripple in space. We’ve known about gravitational waves for a long time.
A black hole is an area of such immense gravity that nothing—not even light—can escape from it. Black holes form at the end of some stars’ lives. The energy that held the star together disappears and it collapses in on itself producing a magnificent explosion.
Gravity is the force by which a planet or other body draws objects toward its center.
What Is Gravity? Gravity is the force by which a planet or other body draws objects toward its center. explore; What Is the James Webb Space Telescope? The James Webb Space Telescope is the largest, most powerful space telescope ever built. explore; What Are Constellations?
Nebulae are made of dust and gases—mostly hydrogen and helium. The dust and gases in a nebula are very spread out, but gravity can slowly begin to pull together clumps of dust and gas. As these clumps get bigger and bigger, their gravity gets stronger and stronger.
Most asteroids in our solar system can be found in the asteroid belt, between Mars and Jupiter. Asteroids hang out in other places, too. For example, some asteroids are found in the orbital path of planets. This means that the asteroid and the planet follow the same path around the sun.
What Is Gravity? Gravity is the force by which a planet or other body draws objects toward its center. explore.
A planet must do three things: it must orbit a star, it must be big enough to have enough gravity to force a spherical shape, and it must be big enough that its gravity cleared away any objects of a similar size near its orbit.