Why haven’t we found aliens yet? From cosmic vastness to self-destruction, here are intriguing reasons scientists think alien ...

December 4 is the fourth annual Call to Earth Day, and young people across the world are taking part in a collective effort to improve the planet they’ll one day inherit.

Comet 67P's water has the same molecular signature as Earth's oceans, suggesting it may have contributed to Earth's water ...

Primordial black holes are enigmatic remnants from the universe's infancy that hold the key to unlocking some of the biggest ...

Scientists and companies increasingly support blocking some sunlight to avoid the worst impacts of global warming.

The last month of the year normally does not present many clear skies in our part of the country, but we get some great skies ...

See Jupiter at its brightest for the rest of this decade, and one of the best meteor showers will compete with the Moon as it ...

The massive space rock is large enough to wipe out a small city, and it's moving toward Earth at about 27,500 miles per hour, ...

Scientists say cometary dust affects interpretation of spacecraft measurements, reopening the case for comets as potential ...

Earth? NASA’s Planetary Defenders is a gripping documentary that follows the dedicated scientists involved in the high-stakes ...

The researchers said they had no reason to believe the three-planet model of the Kepler-51 system was inaccurate, and they successfully used the model to predict the transit time of Kepler-51b in May ...

Late December marks the beginning of winter. When does winter officially start? What is the first day? When is winter ...