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Stefanyshyn-Piper on MDDK during STS-126 NASA ID: s126e005026 S126-E-005026 (14 Nov. 2008) --- Astronaut Heidemarie Stefanyshyn-Piper, STS-126 mission specialist, attired in her shuttle launch and entry suit, is pictured on the middeck of Space Shuttle Endeavour during post launch activities.

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Three Siblings, Three Fates: Earth, Mars, and Venus

Life needs CHNOPS, the six essential elements Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, and Sulphur. Curiosity found them on ancient Mars, but a new study shows Earth was born without them. Only a lucky impact with Theia made our world habitable. In contrast, Venus never stood a chance. Meet the three planetary siblings and discover why only Earth became a cradle for life.

The Rocky Road to Mars

Mars’s mantle contains ancient fragments up to 4km wide from its formation—preserved like geological fossils from the planet’s violent early history.

Muon Detector

Cosmic Rays and Muons

Cosmic rays are hitting the atmosphere constantly. One of the products of the collisions is muons, and we can detect muons on the surface of the Earth to learn about the cosmic rays.