- #1
Netspirit
- 18
- 0
Hi,
Apart from the redshift of electromagnetic waves (which we do observe), is there any other evidence of space expansion that is not based on redshift? If not, is there a theoretical experiment that could let us observe and measure space expansion?
Here I am assuming that space is not just the medium for electromagnetic waves to commute in - there are other things going on (like motion of matter) that must be affected by space expansion.
Would it be possible, for example, to measure the degree of metric expansion by seeing how an elliptical orbit of a galaxy cluster gets "elongated" when it moves sufficiently far away from its center of attraction?
(I understand that electromagnetic waves may still be needed for us to observe such an event, and they will be redshifted the usual way, but I hope it can be accounted for. I also understand that the "experiment" may require too much time to be practical).
Thanks
Apart from the redshift of electromagnetic waves (which we do observe), is there any other evidence of space expansion that is not based on redshift? If not, is there a theoretical experiment that could let us observe and measure space expansion?
Here I am assuming that space is not just the medium for electromagnetic waves to commute in - there are other things going on (like motion of matter) that must be affected by space expansion.
Would it be possible, for example, to measure the degree of metric expansion by seeing how an elliptical orbit of a galaxy cluster gets "elongated" when it moves sufficiently far away from its center of attraction?
(I understand that electromagnetic waves may still be needed for us to observe such an event, and they will be redshifted the usual way, but I hope it can be accounted for. I also understand that the "experiment" may require too much time to be practical).
Thanks