Pluto: The Last Picture Show

In his second “insider blog” about the New Horizons mission, principle investigator Alan Stern offers a look at what we might find at Pluto.

Mysterious X-rays Spotted in Galactic Center

NASA’s NuSTAR mission has detected an unexpected haze of high-energy X-rays in our galaxy’s center, perhaps the signal of a mass stellar graveyard.

Mapping Dark Matter


Two projects are mapping the distribution of dark matter in the universe, probing scales both large and small.

Best Evidence Yet That Black Holes Exist

A team of astronomers has found indirect evidence of a supermassive black hole’s event horizon, providing further proof that these wacky objects actually exist in nature.


This Week’s Sky at a Glance, May 8 – 16

The nova in the Sagittarius Teapot is continuing to vary around naked-eye brightness, while Venus and Jupiter shine bright at dusk.

Big Sunspot Group Now in View

For sunwatchers who’ve been disappointed by this weak solar maximum, Active Region 2339 offers something to cheer about.

Do We Have Pieces of Pallas on Earth?

Chips of Pallas grace meteorite collections around the world. See where they all came from when the asteroid reaches opposition this spring.

Tour May’s Sky: Planet Trifecta

The three brightest planets – Venus, Jupiter, and Saturn – grace our evening skies this month. Mercury makes an appearance too!


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