"Cosmologists calculate the current theoretical size limit of structures to be 1.2 billion light-years, yet both of these structures are much larger – the Giant Arc is almost three times bigger and ...

Look at this incredible view! Galaxies stretching over billions of years in a single small-but-mighty image from JWST with ...

Astronomers have detected a promising sign of a ninth planet lurking at the the farthest reaches of the Solar System.

In the summer of 1995, Robert Williams, then director of the Space Telescope Science Institute, which manages the Hubble ...