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<p>[QUOTE="-jeffB, post: 4904911, member: 27832"]Gravitational lensing. If there's a massive object between us and the distant galaxy, it bends the light coming from that galaxy, and we see the distant galaxy "smeared" along an arc. If things are positioned correctly, we see multiple images of the distant galaxy.</p><p><br /></p><p>In principle, if light bent along one path has to travel a longer distance than light bent along another path, we'd see two images of the distant galaxy <i>from two different times</i>. I don't know whether there are any gravitational lenses arranged in such a way as to make this happen. You'd almost need a convenient supernova in the distant galaxy to check for it, and even then it might be difficult.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 4904911, member: 27832"]Gravitational lensing. If there's a massive object between us and the distant galaxy, it bends the light coming from that galaxy, and we see the distant galaxy "smeared" along an arc. If things are positioned correctly, we see multiple images of the distant galaxy. In principle, if light bent along one path has to travel a longer distance than light bent along another path, we'd see two images of the distant galaxy [I]from two different times[/I]. I don't know whether there are any gravitational lenses arranged in such a way as to make this happen. You'd almost need a convenient supernova in the distant galaxy to check for it, and even then it might be difficult.[/QUOTE]
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