Redshift = expansion?? I'm not a physicist so I'll probably be laughed at for asking this. I understand the concepts of redshift and the Doppler effect being used to substantiate the hypothesis that the universe is expanding, indeed accelerating, since the farther an object is the higher its redshift. This fits. But, please tell me there is more than this to say that the universe is expanding and accelerating. I mean, there may be some undiscovered property of space that shifts the wavelength of light proportional to the distance traveled. I'm not invoking any ether theories or anything. I just mean, there has to be other data besides redshifting to confirm the expansion of the universe. I'd hate to know that so much theory is built on one type of data point. Can someone educate me?