this post was submitted on 21 Jun 2024
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Yes. In low orbit like the space station they mostly deal with atmospheric drag, even just gas molecules cause it. The ISS is has a “reboost” on a regular basis, often from arriving spacecraft but it can use onboard thrusters.
At much higher orbits the gravity of the sun, moon, differences in earths gravity, and even the tiny force of photons from the sun striking the spacecraft (solar radiation pressure) contribute orbital decay. The Vanguard I satellite was the fourth satellite in space and was expected to stay up for 2000 years, but thanks to solar radiation pressure and some atmospheric drag it’s more like 240.