Three plots are spectrograms showing the intensity of radar echo in the Martian ionosphere at three different times on October 19 and 20 (Image NASA / Univ. (newatlas.com)
Over the three months that followed the initial detection, the technique was able to obtain radar echoes from Chandrayaan - 1 seven more times, including during follow - up observations made by the powerful Arecibo Observatory in Puerto Rico. (redorbit.com)
MARSIS scientists hope their instrument will be able to penetrate up to three miles (five kilometers) beneath Mars» surface and return distinguishable radar echoes for sand dunes, rock and potential water deposits. (space.com)