Is There Gravity in Space? Yes

Yes there is gravity. In fact, on the International Space Station (ISS) which orbits Earth at an altitude of around 220 miles (354 km), the force of gravity is still about 90 percent to what it is here on Earth. So how can the ISS be in “zero gravity”?

Well, let’s start with the term “zero gravity.” It is unfortunate that this term gets used so much as it implies exactly that — zero gravity — which is misleading. The correct term is “microgravity.” This is the condition where people or objects “appear” to be weightless, for example, how astronauts and objects can “appear” to float in space.

Gravity can be found everywhere in space, the strength may vary, but it is always there. It causes objects to be pulled toward it; it’s also what holds the moon in orbit around Earth. Gravity is why Earth orbits the sun, and it also keeps the sun in place in the Milky Way galaxy.

A spacecraft could go far enough away from Earth that astronauts inside would feel very little gravity; however this is not why things float on the ISS. In fact it is this relatively strong gravity that holds the ISS in orbit, otherwise they would simply fly off into deep space.

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