# Andromeda Galaxy

1. Apr 14, 2010

### Deepak Kapur

I read that Andromeda galaxy is moving towards our galaxy at a speed of 200,000 miles per hour. Does it mean that Andromeda galaxy has increased mass and slowed time in comparison to us (or the opposite is true or no effect on its mass or time is there)?

No mathematical answers please (I am just a curious observer-neither a mathematician nor a physicist)

2. Apr 14, 2010

### Staff: Mentor

Yes though the difference is extrordinarily small.

3. Apr 14, 2010

### Matterwave

As measured from OUR reference frame...Andromeda's clocks should be moving slower by a small fraction.

4. Apr 14, 2010

### starthaus

The difference is about $$1/2*(1/3600)^2=0.5*10^{-7}$$