Variable

 

Astronomy Picture of the Day: M100: A Grand Design Spiral Galaxy

Majestic on a truly cosmic scale, M100 is appropriately known as a grand design spiral galaxy.

Astronomy Picture of the Day: Across Corona Australis

Cosmic dust clouds are draped across a rich field of stars in this broad telescopic panorama near the northern boundary of Corona Australis, the Southern Crown.

Astronomy Picture of the Day: R Leporis: A Vampire's Star

Better known as Hind's Crimson Star, R Leporis is a rare star in planet Earth's night sky. It's also a shocking shade of red.

Astronomy Picture of the Day: M33: Triangulum Galaxy

The small, northern constellation Triangulum harbors this magnificent face-on spiral galaxy, M33.

Astronomy Picture of the Day: Stars and Dust in Corona Australis

Cosmic dust clouds and young, energetic stars inhabit this telescopic vista, less than 500 light-years away toward the northern boundary of Corona Australis, the Southern Crown.

Astronomy Picture of the Day: Aurora around Saturn's North Pole

Are Saturn's auroras like Earth's? To help answer this question, the Hubble Space Telescope and the Cassini spacecraft monitored Saturn's North Pole simultaneously during Cassini's final orbits around the gas giant in September 2017.

Astronomy Picture of the Day: Nearby Cepheid Variable RS Pup

In the center is one of the most important stars on the sky.

Astronomy Picture of the Day: Symbiotic R Aquarii

You can see it change in brightness with just binoculars over the course of a year.

Astronomy Picture of the Day: Arcs, Jets, and Shocks near NGC 1999

This tantalizing array of nebulas and stars can be found about two degrees south of the famous star-forming Orion Nebula

Astronomy Picture of the Day: LL Ori and the Orion Nebula

Stars can make waves in the Orion Nebula's sea of gas and dust. This esthetic close-up of cosmic clouds and stellar winds features LL Orionis, interacting with the Orion Nebula flow

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