Solar System

Misfit Meteorite Sheds Light on Solar System History

Scientists have discovered the first meteorite that doesn't fall into one of two fundamental groups. The meteorite provides a unique glimpse into the era of asteroid formation and migration.

Near-Earth asteroid

Solar System

How Often Do Chicxulub-level Asteroids Hit Earth?

Asteroids of different sizes crashing on Earth originated from different parts of the main asteroid belt, researchers say; the finding has implications for how often such collisions happen.

Neutron star mergers produce r-process elements

Stellar Science

Metal-poor Stars Shed Light on the Origin of Gold

Explosions of massive stars might have produced gold and other rare heavy elements observed in metal-poor stars in our galaxy’s halo.

Earth's magnetic field

Spacecraft and Space Missions

The Hubble Space Telescope As Cosmic-Ray Detector

Astronomers, using Hubble Space Telescope as a particle detector, have traced cosmic rays flowing in Earth's geomagnetic field.

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