Dubbed "araneiform terrain," the Mars surface formations span over a half-mile long and have hundreds of branches that ...

Astronomers have spotted the biggest pair of black hole jets ever seen, spanning 23 million light-years in total length. That's equivalent to lining up 140 Milky Way galaxies back to back.

"The Milky Way would be a little dot in these two giant eruptions." ...

The eruptions span 23 million light-years from end to end, which is equivalent to lining up 140 Milky Way galaxies back to ...