Enormous galaxy cluster warps spacetime in Hubble image | Digital Trends

Every week, scientists using the Hubble Space Telescope share an image from this beloved piece of space technology, and this week’s image shows a vital astronomical phenomenon in action. While space telescopes can observe very far-off objects if they are bright enough, there is still a lot of the universe that is too far away to observe — which is why researchers make use of a natural occurrence called gravitational lensing.

This warping can have very useful effects, as it bends light coming from far-off objects. If a massive galaxy cluster sits between us and a faint, distant galaxy, then the gravitational lensing effect can act like a magnifying glass, making the light from the background object brighter. This allows astronomers to see some of the most distant — and therefore some of the oldest — galaxies in the universe.

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