Monday, September 29, 2008

Solar Exposure

The stream of charged particles that rushes outward from the sun has weakened to its lowest level in at least 50 years, threatening to allow dangerous cosmic rays from deep space to reach the inner solar system.
Measurements of the solar wind by the Ulysses spacecraft show the wind’s pressure has dropped 20 percent since the mid-1990s, and the temperature of the electrons within the flow has declined by 13 percent.
The solar wind normally keeps the cosmic radiation at bay.
Earth’s magnetic field provides an inner shield to protect life on the planet from the super high-energy electrons and protons arriving from countless light-years away.
But any astronauts traveling to the moon or beyond, outside Earth’s shield, would be at an increased risk of exposure due to the weaker solar wind.
BBC report HERE

...hummm...was the Chinese spacewalker exposed?

0 Comments:

Post a Comment

Subscribe to Post Comments [Atom]

<< Home