NASA will test a key deep space navigation tool this year
The Deep Space Atomic Clock (DSAC) is finally ready for testing, and NASA's JPL has begun preparing it for launch this year after working on it for two decades. Current space vehicles and observatories already use atomic clocks for navigation -- they are, after all, some of the most accurate timekeeping devices ever. However, the way they work isn't ideal for use in vessels going beyond Low-Earth Orbit. See, the atomic clocks space agencies and companies use today need to be paired with ground-based antennas. The antenna sends signals to a spacecraft, and the vessel sends them back to Earth. Current clocks use the difference in time between sending and receiving a signal to calculate a space vehicle's location, path and velocity. It then relays commands to the spacecraft based on those calculations. While signals travel at the speed of light, that process can still take hours -- the farther the spacecraft is, the longer it has to wait for a signal. Deep Space Atomic Cl...