Earth’s inner core has long challenged researchers because seismic waves do not move through it uniformly. Compressional waves generated by earthquakes travel roughly 3 to 4 percent faster along Earth ...

The Russians announced tonight they used improved new sources of power to fire aloft Sputnik II, the half-ton satellite rocketing a dog through the empty miles of space.

NIST scientists calculated that clocks on Mars would be an average of 477 millionths of a second faster than clocks telling ...

Here's how the astronomical phenomenon influences our planet—from the length of our seasons to the way Earth moves through ...