A spacecraft operated by the European Space Agency and the Japan Aerospace Exploration Agency has made its final flyby of Mercury, as scientists now work to guide BepiColombo into the planet’s orbit.

Shutterstock Mercury is already the smallest planet in the solar system (unless you still include Pluto, which some of us are still bitter about). While it is already the smallest, it is actually ...

Mercury appears to move backward (retrograde) in the sky. It's visible briefly in the evening sky, low on the western horizon. You'll need binoculars or a telescope to see it. Mercury will disappear ...

NEW YORK — Scientists have found two Earth-size planets orbiting a star outside the solar system. The discovery shows that such planets exist and that they can be detected by the Kepler spacecraft, ...