NASA's plan to dump the dirt and sand of an asteroid was hampered.
Scientists believed that Bennu, an asteroid, had large open areas suitable for this task, but the spacecraft currently flying around the asteroid found that its surface was stoned and that there were no large areas for sampling.
In an article published by Nature on Tuesday, scientists say they plan to study a number of smaller areas in more detail, which may be appropriate, but adding that sampling these sites is a "big challenge."
Osiris-Rex, launched in September 2016, is expected to bring samples to Earth for further investigation. The whole walk should last seven years.
A small asteroid with a diameter of about 492 m is $ 110 million. km from Earth.
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