As space officials continued to track the debris fields created by Tuesday's collision of two satellites, experts warned that more crashes will inevitably occur in the increasingly crowded orbits above Earth.

By PBS News Hour

A new analysis of moon pebbles collected decades ago has found that the small stones contained traces of water, according to a report Thursday in the journal Nature by Brown University geologist Alberto Saal and his colleagues.

By PBS News Hour

NASA has unveiled plans for crew and launch vehicles to return humans to the moon as the first steps toward building an outpost there and eventually traveling to Mars. NewsHour correspondent Tom Bearden takes a closer look at NASA's space…