Cosmic radiation puts astronauts at risk of Alzheimer's

Even with shielding, the amount of cosmic radiation involved in a trip to Mars could put astronauts on the path to Alzheimer's disease.

Cosmic rays blamed for spaceship crash

After initial suggestions that death-ray-wielding Americans were to blame, Russian space agency Roscosmos has concluded that its lost Martian probe, Phobos-Grunt, was cripped by space radiation.

Cosmic radiation damages astronauts' hearts

Long-distance space travel could harm astronauts' arteries, say University of Alabama at Birmingham researchers.

Earth may be approaching super-hot gas cloud

The Earth may be about to move into a million-degree cloud of interstellar gas, according to Polish and US scientists.