Skip to main content
  1. Home
  2. Space
  3. News

Scientists observe the aftermath of a spacecraft crashing into asteroid

Georgina Torbet
By

When NASA deliberately crashed a spacecraft into an asteroid last year, it wasn’t only a thrilling test of planetary defense. It was also a unique opportunity for scientists to observe an asteroid system and see the effects of the crash, letting them learn more about what asteroids are composed of. Earlier this month, images of the impact captured by the Hubble Space Telescope were released, and now we can see the impact from another view, captured by the European Southern Observatory’s Very Large Telescope (ESO’S VLT).

The Very Large Telescope is a ground-based set of four telescopes located in Chile, which were able to see the aftermath following the DART spacecraft impacting the asteroid Dimorphos. The images show the cloud of debris thrown up by the impact, called the ejecta, between the time just before the impact on 26 September 2022 all the way through to a month later on October 25. Through this time, the cloud developed clumps and spirals and settled into a long tail formed by radiation from the sun.

The evolution of the cloud of debris that was ejected when NASA’s DART spacecraft collided with the asteroid Dimorphos.
This series of images, taken with the MUSE instrument on ESO’s Very Large Telescope, shows the evolution of the cloud of debris that was ejected when NASA’s DART spacecraft collided with the asteroid Dimorphos. The first image was taken on 26 September 2022, just before the impact, and the last one was taken almost one month later on 25 October. Over this period several structures developed: clumps, spirals, and a long tail of dust pushed away by the Sun’s radiation. The white arrow in each panel marks the direction of the Sun. ESO/Opitom et al.

Studying this ejecta using spectroscopy allowed the researchers to see that the cloud did not contain oxygen or water. “Asteroids are not expected to contain significant amounts of ice, so detecting any trace of water would have been a real surprise,” said one of the researchers, Cyrielle Opitom, in a statement. Another thing the team searched for was propellant from the spacecraft, but they didn’t find that either. “We knew it was a long shot, as the amount of gas that would be left in the tanks from the propulsion system would not be huge,” Opitom said.

Recommended Videos

Another study looked at how the asteroid changed once the spacecraft impacted it, by looking at the way light bounced off it.

“When we observe the objects in our Solar System, we are looking at the sunlight that is scattered by their surface or by their atmosphere, which becomes partially polarised,” explained researcher Stefano Bagnulo. “Tracking how the polarisation changes with the orientation of the asteroid relative to us and the Sun reveals the structure and composition of its surface.”

The team found increased brightness and changes in polarization which suggests the impact could have scrapped away the asteroid’s dull, outer layers to expose brighter, untouched material beneath. Alternatively, it could be that the impact threw up small particles of debris rather than larger ones, which could also explain why they reflected more light.

Finally, the European Southern Observatory brought together data from the various studies along with images taken from the spacecraft’s camera before it crashed to create this glorious artist’s impression of the moment the spacecraft collided with the asteroid.

This artist’s illustration shows the ejection of a cloud of debris after NASA’s DART spacecraft collided with the asteroid Dimorphos.
This artist’s illustration shows the ejection of a cloud of debris after NASA’s DART spacecraft collided with the asteroid Dimorphos. The image was created with the help of the close-up photographs of Dimorphos that the DRACO camera on the DART spacecraft took right before the impact. ESO/M. Kornmesser

The research is published in two papers in Astronomy & Astrophysics and The Astrophysical Journal Letters.

Editors' Recommendations

Topics
Georgina Torbet
Georgina Torbet
Space Writer
Georgina is the Digital Trends space writer, covering human space exploration, planetary science, and cosmology. She…
An asteroid just came incredibly close to Earth
An artist's impression of an asteroid approaching Earth

An asteroid just hurtled past Earth in an event described by NASA as “one of the closest approaches by a near-Earth object ever recorded.”

Asteroid 2023 BU zipped by at 7:27 p.m. (4:27 p.m. PT), passing over the southern tip of South America a mere 2,200 miles from Earth’s surface -- a distance that put it well within the orbit of geosynchronous satellites.

Read more
How astronomers worked together to spot an asteroid before it hit Earth
This time-lapse photograph was taken by astronomer Robert Weryk from near his home in London, Ontario, Canada, after NASA’s Scout system forewarned him about the entry of 2022 WJ1 on Nov. 19, 2022. The resulting fireball streaked directly overhead and continued east until it broke up.

This month, a small asteroid hurtled through space toward the Earth and entered the sky above Toronto. Even though it was only around a meter across and burnt up harmlessly in the atmosphere, this asteroid was notable because it was one of the first few asteroids to strike Earth that we knew was coming.

The asteroid, named 2022 WJ1, was first discovered by a project called the Catalina Sky Survey which uses a telescope at the Catalina Station near Tucson, Arizona. It was seen around four hours before it was due to strike Earth, making it just the sixth asteroid to date identified before impacting Earth. The detection was passed to a group called the Minor Planet Center which brings together international data on near-Earth objects and coordinates follow-up observations with astronomers around the world.

Read more
NASA team pauses efforts to deploy Lucy spacecraft’s unlatched array
see lucy spacecraft slingshot past earth fly by

NASA's Lucy spacecraft recently made a flyby of Earth, capturing some stunning images of our planet on its way to investigate the Trojan asteroids in the orbit of Jupiter. But Lucy has had some troubles in the form of a solar array that hasn't fully deployed. Although issues with the array shouldn't prevent the spacecraft from achieving its science goals, the team had hoped to fix the problem. But now, they have had to pause their efforts to get the array into place.

Lucy has two large round solar arrays which collect energy from the sun to power the spacecraft. These arrays were folded up for launch in October 2021, then deployed in a clock-like motion once the spacecraft was in space. One of the two arrays deployed and locked into place as planned, but the second array didn't fully deploy. The array folded out far enough to collect the power needed for the mission. However, because it wasn't fully deployed, it couldn't latch into place, meaning it was not as rigid as it could be.

Read more