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 ...

NASA said that the two planets would appear in the western sky above the horizon around 6:58 pm ET, as evening twilight ends on the East Coast of the United States. At their closest, they’re ...

Ahead of next month’s much-anticipated total solar eclipse, the night sky was illuminated late Sunday ... to enter the shadow at 12:53 a.m. ET, according to NASA, reaching its greatest eclipse ...

Stargazers can view the moon beginning around sunset on Friday, and it will peak at 5:59 a.m. ET Saturday ... When the moon begins its ascent into the sky, it may look a burnt orange hue.

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.