A new satellite image showed a buildup of U.S. Air Force assets at Diego Garcia, a strategic American base in the Indian ...

Japan on Sunday successfully launched a climate change monitoring satellite on its mainstay H-2A rocket, which made its final ...

A rocket successfully launched an Earth science satellite June 28 on the final flight of a vehicle that had long been the ...

Gaia used its thrusters for the last time to push itself away from L2, and is now drifting around the Sun in a “retirement orbit” where it won’t get in anybody’s way.

Gaia is designed to map out the Milky Way in three dimensions, logging out the position, movements and distance of stars, planets, and comets in our Milky Way and beyond.

Astronomers bid an emotional farewell to Gaia, expressing their gratitude for its more than decade-long mission that gave us groundbreaking insights into our home galaxy, the Milky Way.

Launched in 2013, Gaia’s primary goal was to reveal the history and structure of the Milky Way by building the most precise, three-dimensional map of the positions and velocities of a billion stars.

Gaia was preceded in the 1980s and the 1990s by another satellite from the European Space Agency called Hipparcos. ... And so Gaia has made this three-dimensional map of more than a million ...

The Gaia satellite: ... to determine the trajectories of around 150,000 asteroids in our Solar System, or to map 1.3 million quasars, the bright, active nuclei of distant galaxies.

By listening to "music" played by shaking stars, astronomers could use asteroseismology as a new type of cosmic distance ruler, perfecting the 3D map of two billion stars being built by Gaia.