I'm reading Stephen Hawking's "A Briefer History of Time". In it he says that antiparticles can be thought of as regular particles going back in time. Assuming that's true, it logically follows that antiparticles should have antigravity instead of gravity. Do they?

Gnomon

Antiparticles have opposite electrical charge, but the same mass, as their particle counterparts. They don't have antigravity. Jul 27 06, 5:46 PM

PaleBlueDot1

gravity's supposed to come about because of gravitons. If it was going backwards in time, it wouldn't be emitting gravitons, but it would be sucking them up (or the opposite of what it may be), right? Jul 27 06, 8:34 PM

starNumberA399

Mass and time are not related, therfore going forward or backward in time does not affect mass or gravity. Jul 27 06, 9:23 PM

peasypod

If I saw you going backwards in time, I might find some things about you strange, but not your mass. It is the same with the particle-antiparticle interchange. Some things (like electric charge) reverse for the antiparticle, (a negative charge going back in time, would appear deflected like a positive charge going forward in time), while other properties (like mass) are invariant. Jul 28 06, 2:55 AM

Baloo55th

They haven't actually proved the gravitons yet. On the subject of which, if something keeps emitting them, where do they come from? (And whur do 'ee go?) Jul 28 06, 5:44 AM

PaleBlueDot1

Wow. There are still so many of the same people around here. I guess I'll "come out"... I'm TheAlphaWolf, remember me? :P Well... mass is related to gravity, which is related to time in the sense that gravity "slows" time down (I know this is relative and there isn't an objective way to measure this... but the point is that gravity affects time)... so why doesn't time affect gravity/mass? And you have a good point baloo... and also... if gravitons are being emitted, how is gravity an attractive foce? You'd expect things to be sucked in, not being emitted. Jul 28 06, 9:41 PM

peasypod

Well, well, well, Luis, I've have been wondering you know.....you do have a certain, um, style of writing... Well, you can have an attractive force through a particle interchange (the electromagneitic force interchange particle - or boson - is the photon, which can provide an attraction). There are relativistic time dilation effects due to the gravitational field. However this is something different than saying that mass is "time-interchange invariant". Jul 29 06, 12:17 AM

Create a Free FunTrivia ID to add to, request more/new answers, or edit this entry

I love watching babylon 5 but now the new show is all weird and im confused.... can anyone explain to me who is sheridan's child and what is going on (what about that 'parasite' that sheridan was supposed to give his child when he was 16? What adjective would you use to describe someone who says they'll do something, but never follows through? There is a video on youtube that says "Ninet sings im zo ahava." What does "im zo ahava" mean? If an American soldier was going into combat, would his regular life insurance pay if he was killed or died in service due to an accident?

1 Do You Have the Time? The dates of famous events are sketched indelibly in many a memory, but what about the exact times? See if you can guess at what time these very significant 20th century events occurred. Good luck! Famous Dates Difficult 10 Q thejazzkickazz Aug 04 03 2490 plays 2 "He Shall From Time To Time..." Here is a quiz on the 12th episode from the first series of "The West Wing". 'West Wing' - Season 1 Average 15 Q som18 Aug 08 03 1518 plays 3 True or False Time! You have a 50-50 chance of getting these "True or False" questions correct. Good luck and have fun! True or False Average 10 Q quizmasterIII Feb 05 04 2373 plays