CAPE CANAVERAL, Fla.—NASA on Wednesday showed off its first asteroid samples delivered last month by a spacecraft—a jumble of black dust and rubble that’s the most ever returned to Earth.
Scientists anticipated getting a cupful but are still unsure how much was grabbed from the carbon-rich asteroid named Bennu, almost 60 million miles (97 million kilometers) away. That’s because the main sample chamber has yet to be opened, officials said during an event at Johnson Space Center in Houston.
