0

If we (the galaxy) were traveling close to the speed of light; relativity says we would need proportionally more energy to go faster. Given that relative to the cosmic microwave background, the Local Group is moving by 600 km/s; that's 0.2% of the speed of light. Is it possible to look at this in terms of mass/light speed.

i.e.light speed =infinite mass.
.2% light speed =x mass. stationary = mass. x = speed

Qmechanic
  • 201,751
michael roberts
  • 21
  • Space is expanding between galaxies, the galaxies themselves aren't 'moving' - see https://en.wikipedia.org/wiki/Scale_factor_(cosmology) – Noah P Jul 21 '16 at 11:55
  • How are you going to measure your mass in space? – Yashas Jul 21 '16 at 12:48
  • Start with: http://physics.stackexchange.com/questions/133376/why-is-there-a-controversy-on-whether-mass-increases-with-speed?, but this is a duplicate of http://physics.stackexchange.com/questions/237269/can-absolute-speed-be-determined-by-an-objects-mass – dmckee --- ex-moderator kitten Jul 21 '16 at 14:33

1 Answers1

4

No, in our own frame (comoving frame) we are not moving at all. Even though the CMB radiation is defining a preferred frame, to us it looks like the CMB is moving with respect to us - that's why we see a kinematic dipole in the CMB maps: http://scienceblogs.com/startswithabang/2013/06/28/our-great-cosmic-motion/

Photon
  • 4,847