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Photo of exterior view of the International Space Station, taken by NASA astronaut Ron Garan during a spacewalk conducted on July 12, 2011. The photo shows the space station with a Fisheye Camera and the curvature of Earth below.
Space Shuttle Endeavour STS-134
NASA astronaut Andrew Morgan is tethered to the space station

About AMS-02

Researchers also observed a plateau in the positron growth curve and need additional data to determine why. Results suggest that high-energy positrons and cosmic ray electrons may come from different and mysterious sources. Solving the origin of cosmic rays and antimatter increases understanding of our galaxy.

Visit AMS-02.space about About AMS-02

Launch Date

16/5/2011, 8:56 AM EDT

Magnetic Field Intensity

0.14 T

Weight

7.5 t

Size

5x4x3 m

The Alpha Magnetic Spectrometer (AMS) is a state-of-the-art particle physics detector designed to operate as an external module on the International Space Station (ISS). It uses the unique environment of space to study the universe and its origin by searching for antimatter, dark matter while performing precision measurements of cosmic rays composition and flux.

AMS is an international collaboration involving 44 institutions from America, Europe and Asia sponsored by US DOENASA.

AMS was launched by the Space Shuttle Endeavour (STS-134) to the ISS on 16-May-2011, and installed on the upper Payload Attach Point (S3) on 19-May-2011.

AMS is the unique magnetic spectrometer on the Space Station and will operate on the ISS for the lifetime of it.

More on AMS

Explore in depth articles about the Alpha Magnetic Spectrometer.

The Space Shuttle Discovery approaches Russia's Mir space station.

AMS-01: The Precursor Experiment

AMS-01 is the precursor experiment which flew on the shuttle Discovery on the STS-91 mission, from 2nd to 12th of June 1998.

ESA (European Space Agency) astronaut Luca Parmitano, attached to the Canadarm2 robotic arm, carries the new thermal pump system that was installed on the Alpha Magnetic Spectrometer (AMS) during the third spacewalk to upgrade the AMS, the International Space Station's cosmic particle detector.

The Detector: How it's Built and Operated

The objectives of AMS on the ISS include the search for antimatter, investigating the origin of dark matter, and the precision study of cosmic rays, as well as the exploration of new phenomena in the Universe. 

Technicians in the Space Station Processing Facility at NASA's Kennedy Space Center in Florida, attach an overhead crane to the Alpha Magnetic Spectrometer, or AMS, so it can be lifted onto a work stand and processed for launch.

The AMS Collaboration

Since its inception, AMS has been a global endeavour. AMS is an international collaboration of 44 institutions from America, Europe and Asia.

Photo of exterior view of the International Space Station, taken by NASA astronaut Ron Garan during a spacewalk conducted on July 12, 2011. The photo shows the space station with a Fisheye Camera and the curvature of Earth below.

The Physics: What Interests Us?

To study the intrinsic properties of charged cosmic rays requires a detector above the Earth’s atmosphere. AMS, the magnetic spectrometer operating on the International Space Station (ISS), is the only way to provide long term (20 years) precision measurements of charged cosmic rays.