The satellite's four antennas sent back beeps heard on radios around the world. Cruising 500 miles above the globe at 18,000 mph, it completed an orbit every 96 minutes.

Vanguard 1, launched in 1958, holds the record as the oldest human-made satellite still orbiting Earth. Despite being silent for decades, this tiny piece of space history continues to circle our ...

A powerful and mysterious blast of radio waves that astronomers believed was a fast radio burst (FRB) from far beyond the ...

T he earth’s first man-made satellite is nearing the end of the planning stage. Last week the National Academy of Sciences released information about the small, short-lived artificial moon that ...

MOSCOW – It’s been sixty years to the day after the first artificial satellite was launched into space. Sputnik was called the “simplest satellite” since it was only built in a few months ...

A defunct man-made satellite the size of a bus is plunging toward Earth, and will likely arrive, breaking up on reentry, by the end of the week. NASA officials say it's not likely to threaten ...

Space junk is a huge problem—and it’s only getting bigger. Hundreds of thousands of man-made objects are zipping around our planet—from dead satellites to errant nuts and bolts, putting our ...