Outer Space

Zero Gravity Doesn't Exist In Space

News: The Curiosity Podcast is here! Subscribe on iTunes, Stitcher, Google Play Music, SoundCloud and RSS.

Gravity is ever-present in space, pulling objects into orbits around planets and the sun. It may be weaker at certain points of space, such as those that are far away from the sun, but it doesn't ever disappear entirely. The phenomenon of "weightlessness" experienced by astronauts is actually just a constant state of free fall. The astronauts are indeed being pulled towards Earth, but the high speed of the their spacecraft, which is moving sideways relative to Earth, opposes the gravitational force.

Advertisement

Love getting smarter? Sign up to our newsletter and get our best content in your inbox!

Why Are Astronauts Weightless?

Share the knowledge!

Key Facts In This Video

  1. The moon orbits the Earth due to gravitational attractions. 00:37

  2. The ISS orbits about 400 kilometers above Earth. 01:43

  3. The high sideways velocity of astronauts orbiting the Earth causes them to "float" in a constant state of free fall. 02:38

Advertisement