What Is Gravity? | NASA Space Place – NASA Science for Kids
2024年10月11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 gravity at work. Albert Einstein described gravity as a curve in space that wraps around an object—such as a star or a planet.
Gravity | NASA Space Place – NASA Science for Kids
2024年10月11日 · What Is Gravity? Gravity is the force by which a planet or other body draws objects toward its center. What Is a Black Hole?
Videos | NASA Space Place – NASA Science for Kids
2024年10月11日 · You need a rocket with enough fuel to escape Earth’s gravity! What Is a Nebula? A nebula is a cloud of dust and gas in space. What Is a Solar Eclipse? Learn more about what happens when the moon passes between Earth and the sun! explore; Searching for Other Planets Like Ours. Exoplanets are far away and hard to see. How do we look for them ...
What Is a Black Hole? | NASA Space Place – NASA Science for Kids
2024年10月11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 held the star together disappears and it collapses in on itself producing a magnificent explosion.
What Is a Gravitational Wave? | NASA Space Place – NASA Science …
2024年10月11日 · 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 …
What Is an Orbit? | NASA Space Place – NASA Science for Kids
2024年10月11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 between the satellite's tendency to move in a straight line, or momentum, and the tug of gravity pulling the satellite back.
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.
What Is a Galaxy? | NASA Space Place – NASA Science for Kids
2024年10月11日 · A galaxy is a huge collection of gas, dust, and billions of stars and their solar systems. A galaxy is held together by gravity. Our galaxy, the Milky Way, also has a supermassive black hole in the middle. When you look up at stars in the night sky, you’re seeing other stars in the Milky Way.
Science And Technology | NASA Space Place – NASA Science for …
2024年10月11日 · You need a rocket with enough fuel to escape Earth’s gravity! What Is a Gravitational Wave? How do gravitational waves give us a new way to learn about the universe?
Is Time Travel Possible? | NASA Space Place – NASA Science for Kids
2024年10月11日 · Here's how: Einstein's theory also says that gravity curves space and time, causing the passage of time to slow down. High up where the satellites orbit, Earth's gravity is much weaker. This causes the clocks on GPS satellites to run faster than clocks on the ground.