When the Osiris Rex spaceships from NASA returned from their mission to Asteroid Bennu in 2023, it brought more than just old space rocks back and provided answers to puzzles that have been amazed for years. One of the most fascinating questions was why asteroids that should look identical through telescopes were remarkably different from the earth.
The mysterious mystery was killed on two remarkably similar asteroids – Bennu and Ryugu, both of which were visited by rehearsal return missions. These old rocks consist of the same dark, carbon -rich materials and form around the same time during the birth of our solar system 4.5 billion years ago. Logic suggests that you should reflect the light identically, but if Ryugu is examined by space vehicles, it appears slightly red, while Bennu looks significantly blue.
Osiris-Rex in the start configuration (loan: NASA Kennedy by United Stasa/Glenn Benson)
Michelle Thompson, planetary scientist and expert in space reinforcement Purdue University, examines rehearsals of both asteroids to crack this puzzle. Your research, part of three newly published articles based on the analysis of Bennu samples by worldwide experts, shows that these asteroids go through the same weathering processes, but in different stages of a repeat cycle.
Spatial weather is the constant bombing that can endure the rocky body by solar radiation, cosmic rays and micrometeorite effects. This constant attack gradually changes how asteroid surfaces reflect light, and essentially gives them what we could call “tan” that changes their apparent color when they are viewed from the earth.
The breakthrough came when Thompson and her colleagues compared the exposure age of surface particles from both asteroids. They discovered that grains that were collected by Ryugus surface have only been exposed to a few thousand years in the room, while surface grains from Bennu have been exposed to years of years.
This is a colored view of the C-type Asteroid 162173 Ryugu, which can be seen from the onc-T camera on board Hayabusa2 (Credit: ISAS/JAXA)
This age difference explains everything. Instead of presenting two different weathering processes, the asteroids show two snapshots of the same cycle. Rapid piles of asteroids regularly refresh their surfaces through effects and gravitational shifts and releases fresh material, which then weathered again. Bennus Blue’s appearance indicates more advanced weathering, while Ryugus reddish color is an earlier level.
With 1.45 million known asteroids in our solar system, it is neither economically nor physically feasible to visit a fraction of it even. To extrapol and understand the nature of different asteroids by analysis from the earth, is the key to understanding these old remains.
This research enables scientists to correlate with the actual sample analysis of what telescopes see. Such a calibration is crucial for future asteroid examination, be it for scientific studies or for potential mining operations. Knowing how the surface weathering affects the appearance of an asteroid helps to select mission planers to select goals with greater trust.
But the Bennu samples show even more remarkable secrets about the origins of our solar system. Earlier studies discovered salts in the samples, including phosphates that are critical of life on earth and are essential for metabolism and DNA. Scientists found information about an environment that was well suited to start precursor connections for the chemistry of life.
“If we look at the organic molecules of Bennu, we understand an understanding of which types of molecules could have sowed life in the early earth. We will not find life ourselves, but we consider the building blocks that could finally develop to live.” – Michelle Thompson from Purdue University
These materials remain flawless because asteroids are essentially time capsules that have been unchanged since the formation of the solar system. In contrast to earth, where billions of years of geological and biological processes have mixed and changed the original ingredients, asteroids keep the raw materials from which planets were formed.
The solution to the Color Mystery shows how sample return missions revolutionize our understanding of space. By leading scientists back into the demanding laboratories of the earth in distant worlds, they can decode secrets that remain hidden when observing Afar and open new windows both in the history of our solar system and in the potential origins of life itself.
Source: Planetary scientist decodes information in Bennus Surface composition to understand distant asteroids
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