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Most of the X-ray sources seen in this 12-day exposure by the Chandra X-ray Observatory are active galaxies and quasars powered by massive black holes. Ground-based observations show that many of them are shrouded by dust; many others remain unidentified, invisible except in X-rays.
What Happens at the Edge of a Black Hole?

The greatest extremes of gravity in the Universe today are the black holes formed at the centers of galaxies and by the collapse of stars. These invisible bodies can be studied by examining matter swi ...
24 GPS satellites orbit Earth.
Tick-Tock Atomic Clock

Modern navigators rely on atomic clocks. Instead of old-style springs or pendulums, the natural resonances of atoms -- usually cesium or rubidium -- provide the steady 'tick' of an atomic clock. The b ...
Bright scars on a darker surface testify to a long history of impacts on Jupiter
The Strange Spires of Callisto

When NASA's adventurous Galileo spacecraft skimmed a mere 138 km, (123 miles) above the surface of Jupiter's moon Callisto, onboard cameras captured the sharpest pictures ever of that moon's mysteriou ...

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