Caltech is putting up 25 air monitoring sites on rooftops and poles in Altadena (some in Pasadena) to measure PM10 pollution ...

As you're driving around L.A. this week and next, plan to pull over and pull out your camera: The mountains all around us are ...

California has 685 condo complexes on the blacklist, which makes getting government-backed loans nearly impossible.

And now scientists are getting a little closer to understanding how it behaves. The big question is whether this dark energy ...

The DESI experiment shocked cosmologists with a hint that dark energy varies over time. Now, with more data, the conclusions hold up.