Neil Armstrong and Edwin "Buzz" Aldrin began collecting 50 pounds (22.7 kilograms) of material from the moon's surface after they had taken their first steps on the moon. They compared the moon's force of gravity to Earth's, noting that in order to walk, they had to lope slowly or hop like a kangaroo with two feet together. Inserting the American flag into the ground took quite a lot of effort because it was difficult to penetrate the moon's soil.
The astronauts took photos and collected two core-tube samples. They left behind for posterity a recording of messages from 73 countries, a patch from the ill-fated Apollo 1 and some medals from Russian astronauts. Twenty-one hours after they landed, they boarded the Lunar Module Eagle and returned to the Command Module Columbia, waiting for them in the moon's orbit. On July 24, eight days after liftoff from Earth, they landed in the Pacific Ocean.
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