A puzzling meteorite with unknown origins: It could be from the surface of Mercury, but something doesn't quite add up. ->
Data acquired from NASA's MESSENGER probe suggest that Mercury used to have an ocean of molten rock. ->
Kepler-37b is the definition of "tiny." But how tiny is tiny? ->
For John Glenn, being the first American to orbit the Earth on Feb. 20, 1962 was a stroke of luck. ->
For the first time we see Earth -- in astronomical parlance -- as a superior planet, 114 million miles outward from Mercury.
While watching a video of a coronal mass ejection travel from the sun, it would appear that a solar observatory has discovered a massive alien spacecraft docked next to Mercury.
In 1961, test pilots Neil Armstrong and Milton Thompson built their own research aircraft.
Former flight director Chris Kraft is adding his to the growing number of dissenting voices decrying NASA's next launch system as deeply flawed.
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