companion

 

The Conjunction of the 46p/wirtanen comet, the hyades cluster and the Pleiades cluster


Astronomy Picture of the Day: Meteor before Galaxy

What's that green streak in front of the Andromeda galaxy? A meteor.

Astronomy Picture of the Day: Spiral Galaxy NGC 6744

Beautiful spiral galaxy NGC 6744 is nearly 175,000 light-years across, larger than our own Milky Way.

Astronomy Picture of the Day: From the Galactic Plane through Antares

Behold one of the most photogenic regions of the night sky, captured impressively.

Trifid Nebula and his companion

M20 and M21

Astronomy Picture of the Day: A Plurality of Singularities at the Galactic Center

A recent informal poll found that astronomers don't yet have a good collective noun for a group of black holes, but they need one.

Astronomy Picture of the Day: Galaxies in the River

Large galaxies grow by eating small ones. Even our own galaxy practices galactic cannibalism, absorbing small galaxies that get too close and are captured by the Milky Way's gravity.

Astronomy Picture of the Day: The View Toward M101

Big, beautiful spiral galaxy M101 is one of the last entries in Charles Messier's famous catalog, but definitely not one of the least.

Astronomy Picture of the Day: NGC 289: Swirl in the Southern Sky

About 70 million light-years distant, gorgeous spiral galaxy NGC 289 is larger than our own Milky Way

Astronomy Picture of the Day: Announcing Nova Carinae 2018

How bright will Nova Carinae 2018 become?

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