Gravity in Space

Contrary to common opinion, gravity is everywhere, even in space. Anything with mass creates gravity. The effect of gravity decreases as distance increases. At extreme distances, the gravity exerted on a particular object might be almost zero, but is never completely absent.

At the orbit of the International Space Station, Earth's gravitational pull is about 90% of what it is at Earth's surface.

Astronauts on spaceships in outer space are affected by gravity in the same way that their spaceships are. They are both orbiting Earth, which means they are falling sideways (in orbit) at the same time they are falling toward Earth.


On Earth, astronauts feel the force of gravity as weight, because the ground prevents them from falling. In outer space there is no ground to push against astronauts. As they orbit and fall toward Earth at the same rate as their spaceship, astronauts feel weightless, as if there were no gravity.

International Space Station Facts

The International Space Station if reduced to two dimensions is roughly the size of a soccer pitch, at about 73 meters (239 feet) in length and 109 meters (356 feet) in width. It orbits the Earth at an altitude of 330 to 435 km (205 to 270 miles).

Incidentally, In 2001, Pizza Hut paid the Russian space agency $1 million to send a pizza to the ISS, Including a Pizza Hut logo on a Soyuz rocket and a video of a cosmonaut Yuri Usachov​ giving a thumbs up after eating some of the pizza. The space pizza, per the BBC, “spending a long time in space has the effect of deadening the taste buds, so extra salt and spices were added to the pizza and salami had to be used as pepperoni lacked the necessary shelf life, growing moldy.​”