New research adds doubt that a prominent European astrophysics experiment may have found evidence of dark matter.

AMSTERDAM, May 23, 2011 /PRNewswire/ -- Four days after the Endeavour launch the Alpha Magnetic Spectrometer (AMS-02) has been successfully installed on the International Space Station (ISS). The 6700 kg Alpha Magnetic Spectrometer (AMS-02) is a state-of-the-art particle physics detector designed to operate as an external module on the International Space Station.

After successfully docking with the International Space Station, the Endeavour and station crews wasted no time getting down to business installing a $2 billion cosmic ray detector with the goal of scanning the invisible universe for years to come.

Space shuttle Endeavour set out on its final mission on Monday after a two-week delay.

Physicists at Rice University and their collaborators have detected the antimatter partner of the helium nucleus, antihelium-4.