The samples are from a Japanese space probe called Hayabusa-2, which gathered 5.4 grams of rocks and dust from the near-earth asteroid Ryugu.
Researchers discovered "amino acids and other organic matter" in dust from the asteroid Ryugu, adding weight to a theory that life on Earth was brought from outer space.
Hayabusa2 spacecraft released a small capsule that has landed in a remote, sparsely populated area of Woomera, Australia, Japan's space agency says.
The German-French Mascot lander which was released from the unmanned spacecraft Hayabusa2 will analyse the asteroid's surface properties, collect samples and send back to researchers on Earth.
The unmanned Hayabusa2 spacecraft will spend about two months looking for suitable landing places on the uneven surface.
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