95 incredible spectacles of science
Universe hubble
The Hubble Space Telescope captured this image of RS Puppis, one of the brightest Cepheid stars visible in our galaxy. The star lies some 6,000 light-years away in the Puppis constellation. In addition to being beautiful, stars like this one are vital to solving a long-standing astrophysical mystery: How fast is the universe expanding? Different methods, it seems, are spitting out different answers to that question. And that’s a big deal.
"If we're getting different answers that means that there's something that we don't know," Katie Mack, a theoretical cosmologist at North Carolina State University (NCSU) and co-author of a new paper on the measurements, told Live Science this year. "So this is really about not just understanding the current expansion rate of the universe — which is something we're interested in — but understanding how the universe has evolved, how the expansion has evolved, and what space-time has been doing all this time."
From stoic primates and graceful sea creatures, to cosmic cannibals and black hole jets!
