Zeta Oph: Runaway Star

Like a ship plowing through cosmic seas, runaway star Zeta Ophiuchi produces the arcing interstellar...

2012-12-29

The Sun Unleashed

On June 7, the Sun unleashed only a medium sized solar flare as rotation carried active regions of s...

2011-06-10

Earth's North Magnetic Pole

A magnetic compass does not point toward the true North Pole of the Earth. Rather, it more closely ...

2004-09-19

Galaxy Cluster Magnifies Distant Supernova

How do you calibrate a huge gravitational lens? In this case the lens is the galaxy cluster Abell 38...

2014-05-05

Cassiopeia A Light Echoes in Infrared

Why is the image of Cassiopeia A changing? Two images of the nearby supernova remnant taken a year ...

2005-06-15

The Keyhole Nebula

The dark dusty Keyhole Nebula gets its name from its unusual shape. Officially designated NGC 3324, ...

1998-01-12

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