Gravity Simple Definition

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nasa.gov
https://spaceplace.nasa.gov › what-is-gravity › en
What Is Gravity? | NASA Space Place – NASA Science for Kids
2025年1月14日 · 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 …
nasa.gov
https://spaceplace.nasa.gov › orbits › en
What Is an Orbit? | NASA Space Place – NASA Science for Kids
2025年1月14日 · Without gravity, an Earth-orbiting satellite would go off into space along a straight line. With gravity, it is pulled back toward Earth. A constant tug-of-war takes place …
nasa.gov
https://spaceplace.nasa.gov › nebula › en
What Is a Nebula? | NASA Space Place – NASA Science for Kids
2025年1月14日 · 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 …
nasa.gov
https://spaceplace.nasa.gov › gravitational-waves › en
What Is a Gravitational Wave? - NASA Space Place
2025年1月14日 · Before this, just about everything we knew about the universe came from studying waves of light. Now we have a new way to learn about the universe—by studying …
nasa.gov
https://spaceplace.nasa.gov › what-is-gravity › sp
What Is Gravity? | NASA Space Place – NASA Science for Kids
Gravity is the force by which a planet or other body draws objects toward its center.
nasa.gov
https://spaceplace.nasa.gov › black-holes › en
What Is a Black Hole? | NASA Space Place – NASA Science for Kids
2025年1月2日 · 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 …
nasa.gov
https://spaceplace.nasa.gov › barycenter › en
What Is a Barycenter? | NASA Space Place – NASA Science for Kids
2025年1月14日 · The center of mass is also called the center of gravity. But sometimes the center of mass is not in the center of the object. Some parts of an object may have more mass than …
nasa.gov
https://spaceplace.nasa.gov › galaxy › en
What Is a Galaxy? | NASA Space Place – NASA Science for Kids
2025年1月14日 · A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity.
nasa.gov
https://spaceplace.nasa.gov › search › gravity
Gravity | NASA Space Place – NASA Science for Kids
2025年1月14日 · What Is Gravity? Gravity is the force by which a planet or other body draws objects toward its center. explore; What Is a Black Hole? Space Place in a Snap tackles this …
nasa.gov
https://spaceplace.nasa.gov › supernova › en
What Is a Supernova? | NASA Space Place – NASA Science for Kids
2025年1月14日 · It’s a balance of gravity pushing in on the star and heat and pressure pushing outward from the star’s core. When a massive star runs out of fuel, it cools off. This causes the …
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