(CNN) — Astronomers have spotted a large and mysterious dark spot within Neptune's atmosphere, and it has an unexpectedly bright companion. The observation was made using the European Southern ...

This image shows Neptune observed with the MUSE instrument at ESO’s Very Large Telescope. A dark spot can be seen in the upper right. Astronomers have observed a huge, mysterious dark spot on the ...

The first-ever ground-based image of a dark spot on Neptune has revealed vital clues as to the origin of such anticyclonic vortices. When you purchase through links on our site, we may earn an ...

Using ESO’s Very Large Telescope (VLT), astronomers have observed a large dark spot in Neptune’s atmosphere, with an unexpected smaller bright spot adjacent to it. This is the first time a dark spot ...

Astronomers have spotted a large and mysterious dark spot within Neptune’s atmosphere, and it has an unexpectedly bright companion.Video above: NASA discovers a question mark in spaceThe observation ...

Scientists are still in the dark about what is causing a huge shadowy patch to appear against the blue background of Neptune’s sky. When you purchase through links on our site, we may earn an ...