Planetary Defenders: After NASA’s DART Comes ESA’s Hera Mission

NASA’s Double Asteroid Redirect Test, DART, mission is intended to collide with the smaller of two bodies of the Didymos binary asteroid system in autumn 2022. ESA’s Hera mission will then perform follow-up post-impact observations. (Credit: ESA)

PARIS (ESA PR) — The world will be watching the milestone launch of NASA’s Double Asteroid Redirection Test, DART, spacecraft on Wednesday, 24 November, intended to alter one small part of the Solar System forever.

DART will collide with the small moon of an asteroid in order to shift its orbit around its parent body – to test the concept of diverting threatening objects away from Earth.

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Highly Porous Rocks Responsible for Bennu’s Surprisingly Craggy Surface

During fall 2019, NASA’s OSIRIS-REx spacecraft captured this image, which shows one of asteroid Bennu’s boulders with a bright vein that appears to be made of carbonate. The image within the circle (lower right) shows a focused view of the vein. (Credits: NASA/Goddard/University of Arizona)

TUCSON, Ariz. (University of Arizona PR) — Scientists thought asteroid Bennu’s surface would be like a sandy beach, abundant in fine sand and pebbles, which would have been perfect for collecting samples. Past telescope observations from Earth’s orbit had suggested the presence of ­­large swaths of fine-grain material called fine regolith that’s smaller than a few centimeters.

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