Around a galaxy just 590 million light-years away, astronomers have discovered a stunning example of one of the rarest ...

Astronomers have found an incredibly rare complete 'Einstein ring' - predicted by Albert Einstein more than 100 years ago.

Dark matter is more than five times as abundant as all the visible matter in the universe. So why can't we see any of it?

The European Space Agency (ESA) has released a spectacular image of an Einstein ring – a circle of light formed around a galaxy by gravitational lensing. Taken by the €1.4bn Euclid mission, the ring ...