This star-making gas cloud is so cold, it's invisible

This zigzagging, orange-ish ribbon of dust and gas is one of the closest star-forming regions to Earth, just 450 light-years away. And yet in visible light, this looks like just a dark patch of nothing in empty space. » 2/16/12 5:58pm 2/16/12 5:58pm

Do black holes help build stars?

We usually think of black holes as cosmic destroyers, heartlessly devouring anything — even a star — that enters their enormous gravitational pull. But there might be another, more helpful side to supermassive black holes that we're only just discovering. » 2/02/12 4:30pm 2/02/12 4:30pm

Celestial filaments link together galaxy clusters into cosmic web

Large groups of galaxies come together to form clusters, and those clusters are linked together by vast streams of hot gas known as filaments. These intergalactic links reach temperatures well over a million degrees and are almost completely invisible...until now. » 11/29/10 9:30am 11/29/10 9:30am