SpaceWatchtower

This graphic shows the central part of a thunderstorm where air is moving upward rapidly (up-draft), as the cloud accumulates a negative ch...

                Meteorite from the planet Mars, on display as part of the new exhibit, Mars: The Next Giant Leap, at The Carnegie Science Ce...

  Time.gov screen-shot from the last Leap-Second inserted in the civil time scale. In this case, displayed is Coordinated Universal Time (UT...

This diagram shows the position of the Earth, in relation to the Sun, at the time of the Winter Solstice, as well as the other solstice an...

NASA Astronaut Eugene Cernan salutes the American flag on the lunar surface, during the final mission of humans to the Moon 50 years ago, A...