... Tonight's Sky . ... ALMA turns its eyes to Centaurus A . ... Centaurus A is a massive elliptical radio galaxy т?? a galaxy that emits strong radio waves т?? and is the most prominent, as well as the nearest, radio galaxy in the sky. ... We can see that the gas to the left of center is moving toward us, while the gas to the right of center is moving away from us, indicating that the gas is orbiting around the galaxy. ... Only registered members of Astronomy.com are allowed to comment on this article....