The U.S. military is suspending its efforts to secure a small Pacific island as the test landing site for a new program using rockets to rapidly deliver cargo anywhere on Earth.
The search for dark matter requires all of the best models, theories, and ideas we can throw at it. A new paper from Julia Monika Koulen, Stefano Profumo, and Nolan Smyth from the University of California at Santa Cruz (UCSC) tackles the sizes and abundance of one of the more interesting dark matter candidates - primordial black holes (PBHs).

