How Satellites Mapped The Whole Ocean Floor

Scientists have been able to create a map of the ocean floor for the first time ever! How did they do it?
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Read More:
Gravity map uncovers sea-floor surprises
http://www.nature.com/news/gravity-map-uncovers-sea-floor-surprises-1.16048
“As though someone had pulled a plug in the oceans and drained them away, a sea-floor map has exposed thousands of never-before-seen underwater mountains and ridges.”

New Seafloor Map Reveals Secrets of Ancient Continents' Shoving Match
http://www.livescience.com/53420-seafloor-map-reveals-continents-evolution.html
“Tectonic plates may have inched across the Earth’s surface to where they are now over the course of billions of years, but they left behind traces of this movement in bumps and gashes under the sea.”
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