As an expert in astrophysics, I can explain that the concept of there being "no gravity in space" is a common misconception. Gravity does exist in space; it's what keeps planets in orbit around stars, moons in orbit around planets, and it's the reason why astronauts are weightless when they're in orbit around Earth. The reason astronauts appear to be weightless is that they are in a continuous state of free-fall, falling towards the Earth but also moving forward fast enough to keep missing it, which is the principle of orbital motion.

Here's the explanation with the key terms highlighted:


1. Gravity is a force that attracts two bodies towards each other, and it's the reason we stay on the surface of the Earth.

2. Orbit is the curved path that an object in space takes because of the balance between the forward motion of the object and the gravitational pull of the larger body it's orbiting.

3. Free-fall is a state of weightlessness where an object, like an astronaut, is falling towards a larger body (like Earth) but does not fall into it because it also has a horizontal velocity that keeps it in a continuous fall, which is what we call orbiting.

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Gravity causes every object to pull every other object toward it. Some people think that there is no gravity in space. In fact, a small amount of gravity can be found everywhere in space. Gravity is what holds the moon in orbit around Earth.read more >>