New Dwarf Galaxies Near Milky Way

Astronomers have found a set of possible dwarf galaxies near our galaxy, a discovery crucial to understanding dark matter.

Messenger Reveals Mercury Mysteries

With just weeks left before it crashes into its host planet, NASA’s Messenger spacecraft is making the most of its extremely low altitude and finding that Mercury isn’t a completely dead world.

Ripples in the Milky Way

Astronomers have detected what look like four undulations in the Milky Way Galaxy’s disk. If the structures are all part of the disk, our galaxy is more than half again as large as we thought it was.

Magnetosphere Mission Launches

NASA’s Magnetospheric Multiscale (MMS) mission will study the behavior of magnetic fields around Earth.


Sky at a Glance, March 20 – 28

Happy Spring Equinox (at 6:45 p.m. EDT on Friday)! In Saturday’s twilight, look for a thin crescent Moon near faint Mars, and read on for many more nice sky sights this week.

Nova in Sagittarius Brightens!

A 6th-magnitude nova erupted inside the Sagittarius Teapot on March 15th. It’s in easy range of binoculars just before dawn — and still brightening.

One Small Order of Ring Galaxies, Please

“One Ring to rule them all.” Join me as we explore a unique class of galaxies forged in the chaos of collision.

Tour March’s Sky: Orion and His Belt

As we transition between seasons, Orion rides high in the evening sky — easily found by spotting the row of three bright stars in his Belt.


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