Where do new stars form in galaxies?
May 24, 2019
Spiral galaxies like our own Milky Way are studded with cold clouds of hydrogen gas and dust, like chocolate chips in a loaded Toll House cookie. Astronomers have long focused on these so-called molecular clouds, suspecting that they are hotspots for star formation. But are they?More
Peering Back in Galactic Time
December 9, 2016
The astonishing beauty of galaxies visible from Earth has enchanted humanity ever since our ancestors first gazed into the twinkling night and wondrously beheld them. Some galaxies look like elegant whirling spirals or cosmic frisbees, while others look like elliptical blobs or lumpy irregular clumps smeared across the sky. The variety of galactic shapes prompts questions as old as astronomy: why do galaxies form these characteristic shapes? Can elliptical galaxies become spirals, or vice versa?More