Didymos and its moon Dimorphos (also known as Didymoon) pose no risk to Earth. However, to highlight their scale, the European Space Agency (ESA) has released compelling visualizations as part of ongoing planetary defense efforts.
Asteroids can approach unexpectedly, as seen in July 2019 when a 100-meter-wide object passed just 70,000 km from Earth—detected only days earlier by Brazil's SONEAR observatory. Astronomers treat these near-misses with utmost seriousness, given that a past impact triggered one of Earth's greatest mass extinctions.
Telescopes like Pan-STARRS, ATLAS, and SONEAR have cataloged thousands of asteroids, yet vigilance remains essential. That's why experts are developing deflection strategies alongside detection systems—just in case.
NASA and ESA are partnering on the DART (Double Asteroid Redirection Test) mission, set to impact Dimorphos in 2022 and alter its orbit around Didymos.
This binary system is ideal for testing: a spacecraft will strike the smaller moon to measure orbital changes. As Tom Statler, a DART program scientist, noted in 2017: "A binary asteroid is the perfect natural laboratory for this test. The fact that Didymos B orbits Didymos A makes it easier to measure results post-impact."
Didymos measures 780 meters across, with Dimorphos at 160 meters—sizes large enough to be hazardous, yet manageable for this mission. ESA's recent scale images over familiar landmarks like Paris help convey their immense scale. Note: In the Paris overlay, the asteroids aren't aligned in the same plane.
These visuals underscore the potential destruction: Even Dimorphos, the smaller body, "could devastate an entire city," warns ESA.
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