The halo of the Milky Way is old. You’ve probably heard that a million times. But can we know more about its age than simply “it’s old”? Yes, we can — and that leads to interesting results!
Image credits: NASA/CXC/M.Weiss/Ohio State/A Gupta et al.
As smaller galaxies collide with our own they’re slowly torn apart. By watching how they spread across the night’s sky we can infer an incredible amount about the shape of the galaxy and the nature of dark matter.
A look at a classic paper exploring a novel technique to select distant galaxies by waiting for them to drop out of the spectra…
What caused the universe to shift from neutral to ionized as it expanded and cooled? Today, we examine clues that indicate it could have been the result of rapid star formation from the earliest galaxies.
Astronomers have recently discovered a number of galaxies made almost entirely of dark matter. Today’s astrobite takes a closer look at one of them.
Dense star clusters gather around the centers of most galaxies. Where do they come from?