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Neutrinos don’t interact strongly with regular matter. Countless neutrinos stream through us all the time with no effect. But neutrinos weren’t always so weakly interacting. In the earliest cosmic moments neutrinos still interacted strongly with protons, neutrons, and electrons. All of these particles were in thermal equilibrium for a time until the Universe could expand to a...


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NASA/Goddard Space Flight Center Illustration of a binary neutron star merger just as the two stars make contact.

All neutron stars have intense magnetic fields. The typical magnetic field of a neutron star is about 100,000 times stronger than the strongest ...


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Hailey Nelson/ Arizona State University Artist’s illustration of a supermassive black hole at the center of a radio galaxy launching powerful jets all the way into the galaxy’s circumgalactic medium.

Supermassive black holes are powerful engines. They can...


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NASA/ESA/P. Jefferies (STScl) Illustration of the stages of a dying star as it collapses into a black hole.

A core-collapse supernova occurs when a massive star reaches the end of its life. After running out of hydrogen and other light elements t...


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El Gordo
NASA Hubble Hubble image of the El Gordo supercluster with the estimated dark matter highlighted in blue.

Seven billion light-years from Earth, there is an unexpected cluster of galaxies. It has two regions in the process of colliding with each other with a com...


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