how do we know the universe expanding? That would almost suggest that the universe comes to an end yet scientists say it is infinite. What makes us think it's infinite?
We know the universe is expanding because we can measure the speeds of distant galaxies. When we do that, we find that all of them are moving away from us, and the further away they are the faster they are receding from us. Edwin Hubble (the guy the space telescope was named after) was the first to discover this.
Is the cosmological redshift (from which we derive distant galaxies' speed and distance from) the only evidence of spacial expansion, or is there other separate evidence?
We know the universe is expanding because we can measure the speeds of distant galaxies. When we do that, we find that all of them are moving away from us, and the further away they are the faster they are receding from us. The farther away galaxies are from us, the faster they recede? This makes it seem like we are in the center of the universe or something. Since I know this is not true, could someone please explain this effect to me better.Please Register or Log in to view the hidden image! I'm guessing it has something to do with the fact that the light from farther galaxies takes longer to arrive here, and therefore we see it as a greater red-shift than the closer galaxies. If so, does this mean expansion is slowing down? Or don't I even have a clue?
Every point in our space/time is moving away from every other point, like points on a skin of an expanding balloon. i had the idea that perhaps the balloon is accelerating (in the 4th dimension) and creating gravity. Gravity as far as i see it ,(0 spin boson) ,is very much like acceleration! if a particle were to accelerate (in another dimension) it would acquire mass. Just an idea.
