NASA warned that the asteroid Bennu, about 490 meters in diameter, could collide with Earth on September 24, 2182, releasing energy equivalent to 22 atomic bombs. The probability, although low, at 0.07%, keeps the scientific community on alert. The OSIRIS-REx mission, launched in 2016, collected samples from the asteroid in 2020, returning to Earth in 2023, to study its composition and trajectory. The objective is to develop planetary defense strategies against possible impacts.
The samples revealed organic compounds and minerals that suggest an aqueous past on Bennu, reinforcing theories about the origin of life on Earth. The space agency is already testing technologies, such as the DART mission, to deflect asteroids. Preventive actions are crucial, even with the event more than 150 years away.
- Asteroid data: 490 meters in diameter, orbit crossing the Earth every 1,195 years.
- Impact energy: Equivalent to 22 atomic bombs, with regional destruction.
- Risk window: Between 2169 and 2199, with highest probability in 2182.
Composition reveals Solar System’s past
The Bennu samples, dating back 4.5 billion years, contain carbon, nitrogen and phosphates, elements linked to the origin of life. Minerals such as serpentine indicate that the asteroid may have had contact with water in the past.
These discoveries suggest that celestial bodies like Bennu contributed to the formation of habitable conditions on early Earth. Analysis continues to confirm hypotheses aboutits role in the Solar System.
Planetary defense strategies
NASA advances technologies to avoid catastrophic collisions. The DART mission in 2022 successfully diverted the orbit of an asteroid, and Bennu could be the next target.
Long-term planning is essential, as adjustments to the trajectory require decades in advance. The agency monitors Bennu’s orbit, influenced by the Yarkovsky effect, which alters its path due to solar radiation.
Efforts include simulations and tests to ensure precision in interventions. International collaboration is also considered to meet the challenge.
Accurately monitored threat
The asteroid Bennu crosses Earth’s orbit every 1,195 years, requiring detailed calculations. The chance of impact, although small, justifies continued monitoring.
NASA uses telescopes and computer models to predict the trajectory. Data from the OSIRIS-REx mission refines these projections, reducing uncertainty.
The risk is greatest in 2182, but the window of concern extends until 2199. The agency is already planning future missions to improve planetary defense.
Arizona’s Barringer Crater, formed 50,000 years ago, is a reminder of the destructive potential of impacts.
Origin of life in focus
Bennu’s analyzes indicate the presence of essential organic compounds, such as magnesium-sodium phosphate. These materials reinforce the theory that asteroids brought “ingredients of life” to Earth. The presence of water in Bennu’s past is a crucial clue, but requires further study.
Historical impacts as a warning
The Barringer Crater, 1.2 km in diameter, shows the effects of past collisions. Bennu, much larger, could cause significant regional damage. NASA emphasizes prevention to avoid high-risk scenarios.
