This infrared view offers the clearest look yet at how dwarf galaxies merge, evolve, trade gas and ignite waves of new stars.

"It means cleaning house, narrowing the viable paths forward, and no longer spending energy on what are evidently dead ends."

SpaceX launched yet another batch of its Starlink internet satellites on Thursday (Dec. 4), sending 28 of them up from California's central coast.

The discovery potentially transforms what we think about how the cosmic environment influences galaxies as they form.

As he did eight months ago, Sen. Ed Markey asked Jared Isaacman if Elon Musk was in the room when President Trump first offered him the job of NASA chief. And, once again, Isaacman demurred.

Levels of potentially dangerous cosmic radiation in Earth's atmosphere rose to a two-decade high in November after a rare solar super-flare pummeled the planet with high-speed particles from the sun.