Pluto is no longer considered to be a planet (but a dwarf planet) and our solar system now has only eight (8) proper planets, astronomers of the IAU decided.
Dark matter and normal matter have been wrenched apart by the tremendous collision of two large clusters of galaxies. The discovery, using NASA's Chandra X-ray Observatory and other telescopes, gives direct evidence for the existence of dark matter.
Scientists at the BNL discover why astronauts are at greater risk when they were exposed to two types of high-energy particles in a short period of time.