I know an object can be stationary relative to another, but is there anything absolutely stationary in the universe? Or is space itself expanding and thus nothing is stationary?
In: Physics
While all motion is relative to some reference frame, some reference frames are better candidates for an “absolute” reference frame than others.
Relative to the cosmic microwave background Earth is moving ~370 km/s towards the constellation of Leo.
If you launched something into space in the opposite direction and were able to accelerate it to 370km/s, that would make it “stationary” relative to the cosmic microwave background, which is probably as close as you get to absolutely stationary.
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