kalkulat@lemmy.world to science@lemmy.world · 6 个月前NASA's solar sail successfully spreads its wings in spacewww.space.comexternal-linkmessage-square69fedilinkarrow-up1489arrow-down11cross-posted to: [email protected][email protected]
arrow-up1488arrow-down1external-linkNASA's solar sail successfully spreads its wings in spacewww.space.comkalkulat@lemmy.world to science@lemmy.world · 6 个月前message-square69fedilinkcross-posted to: [email protected][email protected]
minus-squareMonkderVierte@lemmy.mllinkfedilinkarrow-up1·6 个月前So photons only have no mass if they don’t move? Do they even exist if they don’t move?
minus-squaremarcos@lemmy.worldlinkfedilinkarrow-up4·6 个月前 Do they even exist if they don’t move? No. Or, at least not from our point of view. They only exist moving at the speed at light. All particles with no rest mass only exist moving at the speed of light.
minus-squareMonkderVierte@lemmy.mllinkfedilinkarrow-up1·6 个月前Else they don’t. We are talking quantum here.
So photons only have no mass if they don’t move? Do they even exist if they don’t move?
No. Or, at least not from our point of view.
They only exist moving at the speed at light. All particles with no rest mass only exist moving at the speed of light.
So photons do have mass?
only as long as they exist
Else they don’t. We are talking quantum here.