And it's a dilly of a huge pickle. But there's something in the Universe that might explain it, some scientists argue: the massive, dense, growing concentrations of matter we call black holes. "If ...

"This unique lensing configuration allows us to constrain both the Hubble constant and dark energy parameters simultaneously ...

The Dark Energy Spectroscopic Instrument uses a telescope in Tucson, Arizona, to create a map of the universe's ...

If you were lucky enough to observe a total eclipse, you are certain to remember the halo of brilliant light around the Moon ...