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Welcome to "On This Day ... in Space!" where we peer back in our archives to find historic moments in spaceflight and astronomy. So enjoy a blast from the past with's Hanneke Weitering to look back at what happened on this day in space!

On Sept. 20, 1970, the Soviet Union's Luna 16 moon probe landed on the moon to retrieve a soil sample. Four days later, it became the first robotic spacecraft to return a sample of lunar soil to Earth.

Luna 16 was the first robotic spacecraft to succeed in landing on the moon, scooping up a soil sample and returning it to Earth. Before Luna 16, the Soviet space program had tried and failed five times to return a sample from the moon. Overall, this was the third lunar sample brought to Earth. NASA's Apollo 11 and 12 missions had also brought back some rocks and soil from the moon.

Luna 16 made a soft landing on the lunar surface in a mare known as "the Sea of Fertility," where it retrieved 101 grams of lunar soil.

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Catch up on our entire "On This Day In Space" series on YouTube with this playlist.

Email Hanneke Weitering at or follow her @hannekescience. Follow us @SpacedotcomFacebook and Google+