Record-setting RADAR

Explanation: Radar, a radio frequency technique, has been used to investigate the surface properties of bodies across the solar system, but never beyond Saturn until the New Horizons mission. In a bistatic radar experiment, the signal travels from a transmitter in one location, to a receiver in a separate location near the target object. In this case, the transmission came from NASA's Deep Space Network antenna station, toward Pluto and the radio receiver on the New Horizons spacecraft. This figure shows the New Horizons radio science data, with the bistatic reflectance indicated.

Pluto

Image credit: NASA/SwRI/JHUAPL