Shall we dance? Earth and the moon tug on each other as they whirl through space. The moon's tug causes rising and falling tides on Earth, but the tidally locked moon must flex rock – and the bulge moves as Earth does.
After completing all of its goals and then some, NASA's LADEE orbiter took increasingly daring passes, skimming closer and closer to the moon surface, ultimately crashing just days before it would have run out of fuel.
NASA's Kepler spacecraft has detected an Earth-sized planet orbiting an M dwarf star, scientists announced Thursday. We have some 70 billion M dwarf stars in our galaxy, so this suggests a huge number of potential life-friendly planets.
The first total lunar eclipse of the year will be visible to most of North and South America tonight. Those in the northeast will miss the tail end of the eclipse, but will see the deep red phase some call the 'blood moon'.
NASA's Curiosity rover is eyeing a three-foot-tall sand dune, an ambitious climb for the SUV-sized rover. Despite the size of the climb, NASA doesn't expect the rover to actually catch air on this maneuver.
Migrating Monarch butterfly populations are plummeting, partly due to the loss of milkweed, a wildflower that Monarchs depend on. Teachers, schoolchildren, brides, and others have begun fighting back, one seed at a time.
Most scientists agreed that the Grand Canyon was carved 6 million years ago, until a study in 2012 used new data to argue that the canyon was actually 12 times as old. A new study tries to merge the old and new data into a single story.