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Device on shuttle to investigate radiation shield

A particle detector being prepared for launch Friday aboard space shuttle Endeavour is intended to answer some fundamental questions about physics, but it has a practical side as well — testing a way to shield future astronauts from potentially harmful cosmic rays.Full story

Scientists hope to illuminate universe's dark side

Everything scientists now know about the cosmos, from the Big Bang to black holes, has come from measurements of light rays. Full story

Space mission includes hunt for antimatter galaxies

A cutting-edge experiment hunting for antimatter galaxies and signs of dark matter that was very nearly cancelled is finally poised to voyage into orbit aboard the next-to-last space shuttle mission. Full story

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Exploded Star's 'Stripes' Hold Clue to Cosmic Mystery

Leading theory about cosmic rays shot down

Scientists solve mystery of disappearing sunspots

Huge Solar Eruption Actually Made Astronauts Safer

Balloon Measures Cosmic Rays Bombarding Earth

Earth's exposure to radiation stresses biodiversity, study says

Largest neutrino observatory built at South Pole

Galaxy cluster collisions energize cosmic rays

Moon poses radiation risk to future travelers

Water discovery fuels hope to colonize moon

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Heliosphere
Heliosphere

An artist's concept of the heliosphere, a magnetic bubble that partially protects the solar system from cosmic rays.

RCW 86
RCW 86

This composite photo, based on imagery captured by the XMM-Newton and Chandra X-ray observatories, shows the supernova remnant known as RCW 86. Scientists studied the stellar leftovers to trace the source of energetic cosmic rays.

Cassiopeia A
Cassiopeia A

Fictional superheroes such as Superman have long been graced with X-ray vision, a superpower that allows them to see things invisible to mortal eyes. Real world astronomy embraced the power with the 1999 launch of the Chandra X-ray Observatory, which observes objects such as black holes and supernov