An enormous galaxy cluster warps spacetime in this Hubble image
Every week, scientists using the Hubble Space Telescope share an image from this beloved piece of space technology, andthis week’s imageshows 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 calledgravitational lensing. Gravitational lensing happens when an object like a galaxy or galaxy cluster has so much mass that it noticeably warps spacetime....