Can we nudge an asteroid to save Earth from a potential collision?
In short: NASA's DART mission recently proved that kinetic impact can actually alter an asteroid's trajectory. By slamming a spacecraft into the moonlet Dimorphos, scientists successfully changed its orbit, providing a vital blueprint for planetary defense and the potential redirection of hazardous space rocks.
In September 2022, NASA's Double Asteroid Redirection Test (DART) conducted a landmark planetary defense experiment. The mission targeted the Dimorphos asteroid, a 170-meter moonlet orbiting the larger 850-meter asteroid Didymos. By crashing into Dimorphos at approximately 6 km/s, the spacecraft successfully altered the asteroid's motion, demonstrating that kinetic impact is a viable method for deflection.
The impact's effects were more profound than initially expected. Although researchers aimed to decrease Dimorphos's orbit around Didymos by a minimum of 73 seconds, the collision reduced the cycle from 11 hours and 55 minutes down to 11 hours and 23 minutes. Furthermore, researchers found that the impact even altered the entire binary system's orbital speed around the sun by about 11.7 microns per second.
A key factor in this success was the 'ejecta'—a cloud of debris excavated during the impact. As this debris sprayed into space, it carried away momentum, providing an additional push to Dimorphos due to the law of conservation of momentum. This phenomenon helped drive the deflection beyond the initial mission objectives.
To build on these findings, the European Space Agency (ESA) is developing the Asteroid Impact Mission (AIM). This candidate mission aims to observe the aftermath of such impacts through high-resolution mapping of an asteroid's surface and interior structure. AIM could include the Mascot-2 lander and CubeSats to test deep-space technologies like optical communications.
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Sources
- Summary by Intellect · source: Asteroid Impact Mission
- Also: Double Asteroid Redirection Test (DART) - NASA Science
- Also: NASA's asteroid-smashing DART spacecraft hit so hard, it changed its target space rocks' orbit around the sun | Space
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