The collaboration measured the polarization of light from the cosmic microwave background ... swathes of the sky at multiple frequencies. More information: Erminia Calabrese et al, The Atacama ...

In a historic first, astronomers have detected low-frequency gravitational waves using a galaxy-sized antenna of millisecond pulsars in the Milky Way. Astronomers have heard the faint hum of ...

When they look at sky brightness—what they call the sky background—they use a unit of brightness per area of the sky: how much light is spread out over a given parcel of celestial real estate.