WASHINGTON (AFP) – A NASA spacecraft began orbiting Mercury, becoming the first to fly around the solar system's innermost planet, the space agency said.
WASHINGTON – A NASA spacecraft is poised to enter the orbit of Mercury later Thursday, and it will circle for one Earth year in an unprecedented study of the tiny, hot planet that is closest to the Sun.
WASHINGTON – A NASA spacecraft is just hours from its long-anticipated encounter with a comet, and skywatchers hope the flyby will shed light on how the comet's surface has changed since it skimmed by the Sun in 2005.
