The North American space agency has obtained the first visual proof that celestial bodies in dual systems share matter continuously in outer space. Imagens captured during the DART probe’s final approach revealed specific markings on the surface of the asteroid Dimorphos, indicating that the object receives fragments of its larger companion, Didymos. The phenomenon occurs through collisions at very low speed, compared by researchers to cosmic snowballs hitting the ground extremely gently.
The photographic record underwent rigorous digital processing to eliminate interference from shadows and variations in natural light. Analysis conducted by Universidade scientists of Maryland confirmed that the bright fan-shaped bands are not pickup faults, but rather actual deposits of space dust and gravel. The discovery changes the understanding of the physical dynamics of asteroids close to Terra and provides new parameters for planetary defense models.
Processamento images reveal unprecedented patterns on the surface
The DRACO instrument, a high-resolution camera on board the spacecraft, recorded the final moments before the intentional collision occurred in September 2022. The raw data sent to Terra showed a complex surface, full of loose rocks and topographic irregularities. Astronomers applied albedo correction techniques to isolate real terrain features and remove visual effects caused by oblique solar lighting.
The result of the image processing exposed subtle marks that extend across the surface of Dimorphos. The researchers carried out experiments in the laboratory using sand and different types of gravel to simulate microgravity conditions. Practical tests reproduced exactly the same fan-shaped deposits observed in space, without the formation of traditional impact craters that would mark violent collisions.
The scientific team calculated that the material travels between the two celestial bodies at an approximate speed of 30.7 centimeters per second. Essa’s extreme slowness allows the fragments to gently land on the smaller asteroid, accumulating over thousands of years. The detailed results of the investigation were submitted and published in the scientific journal The Planetary Science Journal.
Forças thermals and the YORP effect in spatial dynamics
The continuous transfer of mass between the two asteroids does not occur randomly, but follows specific physical principles linked to solar radiation. The central mechanism responsible for ejecting rocks from Didymos is known in astrophysics as the YORP effect. The light from Sol heats the surface of the celestial body unevenly, generating thermal forces that gradually alter its rotational behavior over time.
The constant acceleration of the spin creates an intense centrifugal force in the equatorial region of the main asteroid. Quando rotation speed exceeds the gravitational retention capacity, fragments of rock and dust break away from the surface and enter orbit around the system. A significant fraction of this ejected material ends up crossing the trajectory of Dimorphos.
The natural transfer process presents unique mechanical characteristics identified by researchers:
- Solar radiation acts as the main engine for the acceleration of the larger asteroid.
- Centrifugal force overcomes local gravity and launches debris into space.
- Particles travel in ballistic trajectories of low kinetic energy.
- The material is deposited in the smaller body without causing structural damage or punctures.
- Constant accumulation changes the mass and shape of the receiving object over the millennia.
The visual identification of this cycle of material exchange ends years of theoretical debates in the astronomical community. Previous computational models already suggested the possibility of the phenomenon, but direct photographic evidence in binary systems was lacking to prove the theory definitively.
Estrutura Binary System and Kinetic Drift Test
The set formed by Didymos and Dimorphos represents a very common configuration in the nearby universe. Estimativas astronomical measurements indicate that about 15% of the asteroids orbiting in the vicinity of Terra have a gravitational companion. Didymos acts as the main body with a diameter of approximately 780 meters, while Dimorphos orbits around it with a diameter of approximately 160 meters.
NASA’s original mission had as its primary objective to test the feasibility of the kinetic impact technique for protecting Terra against space threats. The probe’s head-on collision with Dimorphos changed the smaller asteroid’s orbit time by exactly 33 minutes. The success of the operation confirmed that humanity has technology capable of modifying the trajectory of dangerous celestial bodies in advance.
The force of the artificial impact generated a massive cloud of debris, releasing millions of kilograms of rocks and dust into deep space. The recoil force caused by this sudden ejection of material acted as an additional propellant. The phenomenon increased the momentum increase factor by about two times, doubling the effectiveness of energy transfer from the spacecraft to the asteroid.
Contraste between natural processes and human intervention
Thorough analysis of the images allowed scientists to clearly separate ancient geological marks from the effects caused by the probe’s arrival. The natural material transfer driven by the YORP effect occurs continuously, silently and at extremely low speeds. The bright bands discovered by the DRACO camera are the result of a gradual remodeling process that has been operating for millions of years in the binary system.
The event provoked by the North American space agency in 2022 represented an abrupt rupture in this ancient dynamic. The collision ejected fragments at high speed, creating a comet-like tail of debris that stretched thousands of kilometers. Observatórios ground-based and space telescopes followed the evolution of this dust cloud for months after the initial shock.
The Hubble space telescope provided complementary data essential for understanding the event. The equipment tracked larger rocks, known as boulders, that were ripped from Dimorphos’s surface during the DART mission’s impact. Esses space boulders travel through the void at a speed of approximately one kilometer per hour, demonstrating the colossal difference in energy between artificial intervention and the natural exchange of matter.
Evolução geology and the future of planetary defense
The realization that binary systems are highly dynamic environments forces researchers to review models of geological evolution of small bodies in the solar system. The continuous exchange of rocks and dust means that the surfaces of these asteroids are constantly being renewed. The oldest material ends up buried by new layers of gravel, changing the chemical composition exposed to space.
The improvement of computational simulations will directly depend on the incorporation of these new observational data. Compreender the density, porosity and internal structure of asteroids is a fundamental step in planning future interception missions. A celestial body made up of loose debris reacts to an impact in a completely different way than a massive, cohesive rock.
The information collected by the mission continues to yield relevant scientific discoveries years after the spacecraft’s operations cease. The ability to record subtle details on the surface of distant worlds demonstrates the advancement of optical autonomous navigation instruments. The accumulated data forms the knowledge base necessary to protect the planet against possible collision courses.