Asteroid Defense: 3-Stage Planetary Protection Plan
NASAS DART mission is rewriting the playbook on planetary defence, successfully altering an asteroid’s trajectory. This groundbreaking achievement underscores humanity’s ability to mitigate the threat of asteroid impacts, a critical element of the 3-stage planetary protection plan. Discover how the international Asteroid Warning Network (IAWN) and the Asteroid Terrestrial-impact Last Alert System (ATLAS) work. Learn about the “city-killer” asteroids and the vital role of tracking near-Earth objects (NEOs) for our planet’s safety. News Directory 3 offers insights into the future of space exploration. Explore the exciting developments and missions set to enhance our planetary defense capabilities.Discover what’s next …
NASA’s DART Mission Ushers in New Era of Planetary defense
updated June 13, 2025
Cheers erupted at Johns hopkins University Applied Physics Lab in Laurel, Md., when NASA’s Double Asteroid
Redirection test (DART) mission successfully impacted Dimorphos in September 2022. The DART mission, a
planetary defense initiative, demonstrated that a spacecraft could alter the trajectory of an asteroid.
The collision marked a pivotal moment in space exploration, proving that humanity can take steps to protect
Earth from potential asteroid impacts. The DART mission serves as a critical test for future planetary defense
strategies.
If an asteroid like dimorphos were found to be on a collision course with Earth,a similar interceptor craft
could be deployed years in advance to change its path,averting a potential disaster. The process begins with
identifying and tracking near-Earth asteroids.
Finding and Tracking Asteroids
The Asteroid Terrestrial-impact Last Alert System (ATLAS) in chile plays a vital role in spotting near-Earth
objects (NEOs). In late December, ATLAS detected asteroid 2024 YR4, a previously unknown NEO. Further
observations revealed a growing probability of a collision with Earth.
By late January 2025, the potential impact triggered an alert from the International Asteroid Warning Network
(IAWN) to the United Nations Office for Outer Space Affairs. The alert assessed the regions at highest risk and
the expected damage.
asteroids of 2024 YR4’s size, roughly 60 meters across, strike Earth about once every thousand years. These
“city-killer” asteroids are not large enough to cause mass extinction, but they could be deadly within a 50 km
radius of impact. Fortunately, by late February, further observations ruled out any near-term impact from 2024
YR4.
Chris Philpot
The European Space agency’s Hera mission will rendezvous with the Didymos–Dimorphos asteroid system and study
the aftereffects of NASA’s DART impact close up.
Launch:2024
Rendezvous:2026
Space agencies worldwide track an estimated 95 percent of NEOs larger than 1 km in diameter. The IAWN and
the Space Mission Planning Advisory Group (SMPAG) coordinate these efforts.None of the giant NEOs currently
tracked pose an impact risk to earth for at least the next century.
what’s next
Despite these efforts, manny undiscovered “city-killer” asteroids still pose a risk. continued investment in
planetary defense and asteroid tracking is crucial to protecting Earth from future impacts.