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4/18 Cover

Atom & Cosmos

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The AMS on the ISS

COSMIC RAY COLLECTOR  The Alpha Magnetic Spectrometer (center) analyzes speedy cosmic particles from its perch on the International Space Station. New results may complicate scientists’ understanding of where the particles come from.

the M101 galaxy

STAR BRIGHT  Color differences between some nearby supernovas, such as the one shown here (arrow) in this image of the M101 galaxy about 22 million light-years away, and ones farther away could lead to overestimates of how much the cosmic expansion is accelerating.

Buzz Aldrin on the Moon

STICK THE LANDING  Despite worries that dust might swallow their lunar spacecraft, Buzz Aldrin (pictured above) and Neil Armstrong safely landed and explored the moon's surface during the Apollo 11 mission.

Atom & Cosmos

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