In a recent announcement, NASA highlighted the critical need for international cooperation in the face of potential asteroid threats. This revelation came during a press briefing where experts discussed the outcomes of a hypothetical asteroid-impact exercise conducted by NASA’s Planetary Defense Coordination Office (PDCO).

The exercise, held in April 2024, simulated a scenario where a newly discovered asteroid had a 72% chance of impacting Earth. The goal was to evaluate and improve global preparedness for such a catastrophic event, emphasizing the importance of early planning and international collaboration.

The hypothetical scenario involved a large asteroid on a collision course with Earth, projected to hit on July 12, 2038. The potential impact zone included major cities such as Dallas, Memphis, Madrid, and Algiers, underscoring the global scale of the threat. With an estimated size range between 200 feet to 2,600 feet, the asteroid’s composition remained unknown, adding to the complexity of the response.

Leviticus “L.A.” Lewis, FEMA’s detailee to NASA’s PDCO, stressed the necessity for a coordinated international response. Unlike other natural disasters, an asteroid impact would require unprecedented global cooperation. “We need to organize and start discussing what it would really take to coordinate a large effort,” Lewis said. The challenge lies in deciding who would lead such an effort, whether it would be the United Nations or a coalition of international organizations.

The exercise, the fifth of its kind, brought together nearly 100 participants from various U.S. federal agencies and international institutions. They faced a scenario with many uncertainties, such as the asteroid’s size and composition, and discussed potential responses. These included evacuations and potential deflection missions.

Participants considered three main options:

  1. Waiting for more observations. This would delay any immediate action until the asteroid reappeared from behind the sun, allowing further study.
  2. Developing a flyby mission. Costing between $200 million and $400 million, this mission would gather critical data about the asteroid.
  3. A rendezvous mission. A more expensive option, estimated at $800 million to $1 billion, involving a spacecraft that would closely study the asteroid over time.

Most leaders favored proactive missions but acknowledged political and financial constraints.


The exercise highlighted the necessity of involving international partners early in the process. Establishing credibility and trust is crucial for effective collaboration. An anonymous participant noted, “International involvement early will be critical. That credibility is essential and must be established now.”

While the exercise did not produce a fixed set of rules for responding to asteroid threats, it emphasized the importance of planning, communication, and cooperation. “The actual plan, the specific exercise results, aren’t really anything,” said Lindley Johnson, planetary defense officer emeritus. “It’s the actual going through the process of doing the planning and working together, communicating and working with each other, that is the real purpose of this exercise.”

NASA’s hypothetical exercise serves as a crucial reminder of the potential threats from near-Earth objects. It underscores the need for global readiness and cooperation to protect our planet from such existential dangers. As the world faces increasing challenges from space, it is imperative that nations work together, leveraging technology and international partnerships to safeguard our future.

NASA’s recent exercise and asteroid threat preparedness:

  1. NASA discussing asteroid-threat exercise today: Watch it live –
  2. NASA’s DART mission hammered its target asteroid into a new shape –
  3. NASA crashes DART spacecraft into asteroid in historic test –
  4. Protecting Earth from asteroids is complicated and global –

These links provide comprehensive information on NASA’s planetary defense efforts and the importance of international cooperation in addressing potential asteroid threats.

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