than 2.2 billion light-years away, for more than 13 hours. The gravity of the cluster’s trillion stars, plus dark matter, acts as a 2-million-light-year-wide “lens” in space. This “gravitational lens” ...

High-resolution images taken by the Hubble Space Telescope of Jupiter’s Great Red Spot have revealed that it’s not as stable as we thought. Instead, the Spot is squeezing in and out, with NASA ...

The video begins with a view of the thousands of galaxies in the Hubble Ultra Deep Field and slowly zooms out to reveal the larger Hubble Legacy Field, containing 265,000 galaxies.

A lens within a lens helps us take the temperature of the disk of matter that is spiraling into a black hole in a distant quasar.