- #1
PWiz
- 695
- 116
Around massive bodies, light bends so that we can see multiple images of the same object, such as multiple images of the same galaxy behind the massive body.
I know this seems kind of a dim question, but how can we know that the similar images we pick up are light rays from the same object that have undergone gravitational lensing or whether there is an actual cluster of galaxies that emit nearly identical light? Given an image, how can we know that two "light spots" that seem identical are from the same source or different sources that emit identical light?
I know this seems kind of a dim question, but how can we know that the similar images we pick up are light rays from the same object that have undergone gravitational lensing or whether there is an actual cluster of galaxies that emit nearly identical light? Given an image, how can we know that two "light spots" that seem identical are from the same source or different sources that emit identical light?