Deep in the core of most galaxies, hidden by spinning clouds of gas and dust, black holes spin like cosmic engines. These giants — some are billions of times heavier than our sun — can shoot out ...

A second J-36 airframe has emerged with significant changes to its inlets, gear, and exhaust, offering clues to its state of development.

A newly formed black hole, GW190412, was captured fleeing at 180,000 km/h; scientists track its entire cosmic trajectory for the first time.

We measure the “warmness” of the dark matter, i.e. the comoving root-mean-square thermal velocity v hrms (1) , with nearly 3000 spiral galaxy rotation curves in the ...