LAUREL, Md. — Alan Stern, head of the New Horizons mission to Pluto, had just three words for the team of scientists and engineers assembled with him on July 14: “We did it.” At 8:52:37 p.m. Eastern ...

Zooming in from the stretches of cosmic dark matter, a vast chunk of our own planet remains untouched. On the far, southernmost point of Earth, the icy kingdom of Antarctica basks in the winds of ...

Scientists predict a sea level rise of 3 to 6 feet or more by the end of this century, a shift that is projected to displace tens of millions of people and devastate coastal cities. Two major factors ...