We still lack a good understanding of the source of ionizing photons in the early Universe. Can envelope-stripping from a binary companion help stars to re-ionize the early universe?
Radio astronomers detect the first signature of a global 21cm signal with some interesting implications for dark matter.
The most distant quasar yet discovered illuminates the early universe…
How do we measure the mass of our own galaxy? Today’s authors use simulations to compare (and improve) several methods.
Yes, even astronomers get competitive. Which team will develop the best method to measure the Hubble constant, H0, using information derived from strong gravitational lensing images?
We report on Day 1 of the winter AAS meeting in National Harbor, MD. Highlights include a spectacular look at Jupiter’s poles, a look at the major upcoming exoplanet survey TESS, and insight into the expanding universe from Nobel prize winner Adam Riess.