Using ground-penetrating electromagnetic currents and other noninvasive techniques, a team of archaeologists have detected a complex that served as a training ground for the ancient Rome's famed gladiators.
New technique for sifting data from NASA's Kepler planet-hunting mission nearly doubles the number of confirmed planets so far. Of the new batch of 715, only four have certain Earth-like characteristics.
A 12-year pause in global warming, after 20 years of rapidly rising surface temperatures, has scientists probing for the reason. Volcanic eruptions and undersea heat storage are emerging as likely explanations.
An X4.9-class solar flare that erupted Monday is so far the strongest this year. The bright flash of light was seen from the Earth, but the material ejected from the sun will most likely not reach our planet.