A NASA spacecraft descended to an asteroid Tuesday and, dodging boulders the size of buildings, momentarily touched the surface to collect a handful of cosmic rubble for return to Earth.

It was a first for the United States — only Japan has scored asteroid samples.

“Touchdown declared,” a flight controller announced to cheers and applause. “Sampling is in progress.”

Confirmation came from the Osiris-Rex spacecraft as it made contact with the surface of the asteroid Bennu more than 320 million kilometers away. But it could be a week before scientists know how much, if much of anything, was grabbed and whether another try will be needed. If successful, Osiris-Rex will return the samples in 2023.

“I can’t believe we actually pulled this off,” said lead scientist Dante Lauretta of the University of Arizona. “The spacecraft did everything it was supposed to do.”

Osiris-Rex took 4 1/2 hours to make its way down from its tight orbit around Bennu, following commands sent well in advance by ground controllers near Denver.

Bennu’s gravity was too low for the spacecraft to land — the asteroid is just 510 meters across. As a result, it had to reach out with its 3.4-meter robot arm and attempt to grab at least 60 grams of Bennu.

The University of Arizona’s Heather Enos, deputy scientist for the mission, described it as “kissing the surface with a short touch-and-go measured in just seconds.” Tuesday’s operation was considered the most harrowing part of the mission, which began with a launch from Cape Canaveral back in 2016.

(SD-Agencies)