Sep 25, 2025 · 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 …

Sep 25, 2025 · 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 waves of …

Sep 25, 2025 · What Is a Black Hole? The Short Answer: A black hole is an area of such immense gravity that nothing -- not even light -- can escape from it. Click here to download this …

Sep 25, 2025 · Because the Sun is the most massive object in the solar system, its gravity makes the planets, asteroids, and comets orbit around it. Objects that are further from the Sun orbit …

Sep 25, 2025 · That's the ruler's center of mass. 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 …

Sep 25, 2025 · 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 …

Sep 25, 2025 · Satellites that orbit close to Earth feel a stronger tug of Earth’s gravity. To stay in orbit, they must travel faster than a satellite orbiting farther away.

We know that the Moon has almost no atmosphere and only about one-sixth of Earth’s gravity. We even know that there is quite a bit of frozen water tucked away in craters near the Moon's …

Sep 25, 2025 · Answer your questions: What is the Big Bang? What is a black hole? What is a planet? What is gravity?

Scroll up to see what's in each level of Earth's atmosphere!