in a universe that had only one particle, would it always be at rest? couldnt it have momentum?

Answer 1

It would still be moving but you wouldnt be able to see it in motion relative to nothing else in space.

Answer 2

Likely there are four options because the particle could be at rest or in linear or rotational motion or both (exhibiting momentum). Any motion would likely result from the process that created the single particle (two photons combine, etc.). Linear motion would be exhibited by a Doppler effect if any energy (photons) are emitted although there would be absolutely no simple frame of reference (and no observer). A single particle could be an atom or molecule (built up from electrons, protons and neutrons) also containing excess energy that could be emitted as photon(s). The smallest (ordinary) particle would be an electron (or positron). Of course photons can behave as particles but must travel at the speed of light (relative to what?). A single particle would travel through a perfect space because it alone would possess gravitational attraction (that distorts space) and there likely would be no light if photons are excluded as particles.

Answer 3

I'd say always at rest, since nothing else would have been able to touch it and impart momentum.

Answer 4

the universe have one particle but it appears as moving. you cannot seal the real suchness

Answer 5

rest and motion are not absolute

Answer 6

Depends where and how it was formed.

Answer 7

How would we know?

Answer 8

what would it bond with?

Answer 9

nerd.