Hidden Ultrarelativistic Spine in a Blazar Jet
In 2017, the Antarctic neutrino telescope IceCube detected a particle with an energy of about 290 TeV arriving from deep space.
A Sideways Glimpse into the Hearts of Stars
A red giant in a globular cluster is a star in retirement. It has burned up the hydrogen in its core and now lives off fusion in a thin shell around a helium ash core.