Galaxies are not islands in the cosmos. While globally the universe expands—driven by the mysterious "dark energy"—locally, ...

The European Space Agency’s Gaia mission has almost completely depleted the cold gas propellant that kept it spinning and ...

A new effort to map the rumblings in spacetime caused by ... an array of rapidly spinning neutron stars spread across the galaxy — show this "gravitational wave background" may be louder than ...