Galaxies

A new study proposes that ultrahigh-energy particles from space may have violent local origins, but not all observations are in agreement

The influential decadal survey champions the pursuit of potentially habitable worlds but offers few details for the near future

Dark energy and exoplanets prioritized by decadal survey.

Einstein@Home, a distributed computing project searching primarily for gravitational waves, has found its first pulsar

Sometimes we forget where a story really starts. Are electric cars new? Where did malaria start? Who invented spaghetti? Read on, for the surprising origins of many strange and familiar things

The European Space Agency's Planck mission team has released the spacecraft's first full map , charting the entire sky from August 2009 to June 2010.

A shock wave from an exploding star 4.5 billion years ago looks to have begun the collapse of the molecular cloud that formed the sun and planets

This view from the European Southern Observatory's La Silla Paranal Observatory in Chile shows a nearby star-forming region, some 500 light-years away, in the constellation Corona Australis (the Southern Crown).

Computer simulations show that stars of the Milky Way's halo originated in older galaxies torn apart by collisions. Cynthia Graber reports

Astrophysicists put the upper limit of the mass of the neutrino at 0.28 electron volt, based on the distribution of galaxies according to the 3-D Mega Z map. Steve Mirsky reports