In a groundbreaking achievement for planetary defense, NASA's Double Asteroid Redirection Test (DART) mission has successfully altered the orbit of asteroid Dimorphos and its larger companion Didymos around the sun. According to multiple reports, the impact not only changed Dimorphos' orbit but also affected Didymos, demonstrating humanity's ability to deflect asteroids that could pose a threat to Earth.
Key Takeaways
NASA's DART mission successfully altered the orbit of asteroid Dimorphos and its larger companion Didymos around the sun. The impact reduced their orbital period by less than a second, demonstrating humanity's ability to deflect asteroids for planetary defense.
- NASA's DART spacecraft intentionally collided with asteroid Dimorphos in 2022.
- The impact altered the orbit of both Dimorphos and Didymos around the sun.
- The orbital period was reduced by less than a second, marking a success for planetary defense.
- Debris from the collision provided additional momentum, enhancing the deflection effect.
The DART spacecraft intentionally collided with Dimorphos in 2022 as part of a planetary defense test. New observations reveal that the mission was successful, altering the orbit of both asteroids. The time required for Didymos and Dimorphos to complete one solar orbit, which takes about 770 days, permanently decreased by less than a second after the impact.
According to CNN, the change in the binary system's orbital speed was about 11.7 microns per second, or 1.7 inches per hour. This small change can make a significant difference over time, potentially preventing hazardous objects from hitting Earth. The Los Angeles Times reported that the impact cut the duo’s travel time around the sun by 0.15 seconds.
The DART mission marks the first time a human-crafted object has altered the path of a celestial body as it orbits the sun, according to study authors cited in Daily Mail. While Didymos and Dimorphos have never posed a risk to Earth, the binary system provided NASA with the perfect scenario to evaluate how effectively a spacecraft could be used as a deflective tool.
When DART slammed into Dimorphos, a massive cloud of debris was released into space. Although the 560-foot-wide space rock only lost 0.5% of its mass, the debris released was 30,000 times greater than the spacecraft’s mass. The force of the rubble spewing from the asteroid packed more of a punch than the spacecraft did when it slammed into the space rock, helping to shrink the time it takes for the pair of asteroids to orbit the sun.
Scientists relied on ground-based observations and data from stellar occultations to measure this orbital change. The study’s findings were dependent on 22 stellar occultations taken between October 2022 and March 2025 by volunteer astronomers around the world, as reported by CNN.
More observations and measurements of DART’s effect on the space rocks will be shared once Hera arrives in orbit around the asteroid system later this year. Meanwhile, NASA’s Near-Earth Object Surveyor mission, currently in development, could spot dark, risky asteroids that have remained nearly invisible from Earth-based observatories.
How this summary was created
This summary synthesizes reporting from 3 independent publishers using AI. All sources are cited and linked below. NewsBalance is a news aggregator and media literacy tool, not a news publisher. AI-generated content may contain errors or inaccuracies — always verify important information with the original sources.