NASA said it inadvertently lost contact with its probe Voyager 2 over a week ago. The probe is hurtling through space 12 billion miles from Earth.
Robot explorers have been surveying the Martian landscape for decades. NASA engineers and scientists explain why they take on human characteristics.
Voyager 1 was designed and built in the early 1970s. Documentation could be lost or misplaced, making it difficult to troubleshoot glitches onboard.
They're fueled with the red-hot plutonium-238, a byproduct of Cold War-era nuclear weapons production, and NASA's Perseverance rover is the newest.
2018-12-10T18:45:00Z
NASA says its Voyager 2 probe flew into interstellar space in November and beyond the sun's reach. However, the robot has not left the solar system.
2018-02-04T15:24:00Z
After years of effort, a group of music aficionados has finally released the full audio of NASA's famous Voyager golden records on vinyl records.
2017-12-06T20:13:51Z
In the 1970s, NASA launched two nuclear-powered Voyager probes. One refused to communicate with Earth while the other flew on a fuel-leaking rocket.
Radio waves emitted by planets and moons sound downright spooky when converted into audio.
2017-09-26T17:54:00Z
Engineers bought all of the kitchen-grade aluminum foil they could find at a supermarket to protect the Voyager probes from Jupiter's wrath.
If aliens ever find one of NASA's two Voyager spacecraft, each has a golden record with what may be the last surviving recordings of life on Earth.
2017-08-22T13:31:13Z
For a little blue dot, we certainly get around.
VIDEO: A message from 1977.
"That's here. That's home. That's us."
Sagan, who would have been 81 years old today, created an iconic snapshot of humankind.
Watch out, Beyonce.