kalkulat@lemmy.world to science@lemmy.world · 1 年前NASA's solar sail successfully spreads its wings in spacewww.space.comexternal-linkmessage-square65linkfedilinkarrow-up1480arrow-down11cross-posted to: technology@lemmy.worldspaceflight@sh.itjust.worksworldinprogress@lemmy.worldastronomy@mander.xyztechnology@lemmit.online
arrow-up1479arrow-down1external-linkNASA's solar sail successfully spreads its wings in spacewww.space.comkalkulat@lemmy.world to science@lemmy.world · 1 年前message-square65linkfedilinkcross-posted to: technology@lemmy.worldspaceflight@sh.itjust.worksworldinprogress@lemmy.worldastronomy@mander.xyztechnology@lemmit.online
minus-squaremarcos@lemmy.worldlinkfedilinkarrow-up4·1 年前 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-up1·1 年前Else they don’t. We are talking quantum here.
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.