Study Findings: An Evaporite Sequence from Ancient Brine Recorded in Bennu Samples

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Image (Credit): Up close view of Asteroid Bennu. (NASA)

Nature abstract of the study findings:

Evaporation or freezing of water-rich fluids with dilute concentrations of dissolved salts can produce brines, as observed in closed basins on Earth and detected by remote sensing on icy bodies in the outer Solar System. The mineralogical evolution of these brines is well understood in regard to terrestrial environments, but poorly constrained for extraterrestrial systems owing to a lack of direct sampling. Here we report the occurrence of salt minerals in samples of the asteroid (101955) Bennu returned by the OSIRIS-REx mission. These include sodium-bearing phosphates and sodium-rich carbonates, sulfates, chlorides and fluorides formed during evaporation of a late-stage brine that existed early in the history of Bennu’s parent body. Discovery of diverse salts would not be possible without mission sample return and careful curation and storage, because these decompose with prolonged exposure to Earth’s atmosphere. Similar brines probably still occur in the interior of icy bodies Ceres and Enceladus, as indicated by spectra or measurement of sodium carbonate on the surface or in plumes.

Citation: McCoy, T.J., Russell, S.S., Zega, T.J. et al. An evaporite sequence from ancient brine recorded in Bennu samples. Nature 637, 1072–1077 (2025).
https://doi.org/10.1038/s41586-024-08495-6

Study-related stories:

Smithsonian Magazine

Sci.News

BBC

It’s a Bird, It’s a Plane, It’s That Dumb Car

Posted on by onespaceman2000
Credit: Image by Enrique from Pixabay.

A near-Earth object (NEO) recently designated as 2018 CN41 ultimately was deleted because it was determined to be the Tesla Roadster launched into space back in 2018. As noted in an Astronomy article, this type of confusion over orbiting objects, including legitimate spacecraft looping past the Earth, need to be better cataloged and shared among astronomers.

And who would collect and monitor this information? The Minor Planet Center, of course, which was set up years back with this very mission. As the Center’s site notes:

The Minor Planet Center (MPC) is the single worldwide location for receipt and distribution of positional measurements of minor planets, comets and outer irregular natural satellites of the major planets. The MPC is responsible for the identification, designation and orbit computation for all of these objects. This involves maintaining the master files of observations and orbits, keeping track of the discoverer of each object, and announcing discoveries to the rest of the world via electronic circulars and an extensive website. The MPC operates at the Smithsonian Astrophysical Observatory, under the auspices of Division F of the International Astronomical Union (IAU).

It seems like a simple thing to ask given the risk of NEOs damaging spacecraft of plummeting towards the Earth. It would be an even easier monitoring task if we did not throw junk into space just for the fun or it.

One can only hope the Tesla Roadster becomes a shooting star so that we have on less piece of junk to monitor.

Space Stories: Starliner Not on the Schedule, More Questions About Artemis, and the Origin of Most Meteorites

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Image (Credit): The International Space Station. (NASA)

Here are some recent stories of interest.

—Space News: “NASA Further Delays First Operational Starliner Flight“

NASA will use SpaceX’s Crew Dragon for its two crew rotation missions to the International Space Station in 2025 as it continues to evaluate if it will require Boeing to perform another test flight of its Starliner spacecraft. In an Oct. 15 statement, NASA said it will use Crew Dragon for both the Crew-10 mission to the ISS, scheduled for no earlier than February 2025, and the Crew-11 mission scheduled for no earlier than July. Crew-10 will fly NASA astronauts Anne McClain and Nichole Ayers along with astronaut Takuya Onishi from the Japanese space agency JAXA and Roscosmos cosmonaut Kirill Peskov. NASA has not yet announced the crew for the Crew-11 mission.

—Bloomberg: “NASA’s $100 Billion Moon Mission Is Going Nowhere“

There are government boondoggles, and then there’s NASA’s Artemis program. More than a half century after Neil Armstrong’s giant leap for mankind, Artemis was intended to land astronauts back on the moon. It has so far spent nearly $100 billion without anyone getting off the ground, yet its complexity and outrageous waste are still spiraling upward. The next US president should rethink the program in its entirety.

—CNRS: “The Origin of Most Meteorites Finally Revealed“

An international team led by three researchers from the CNRS1 , the European Southern Observatory (ESO, Europe), and Charles University (Czech Republic) has successfully demonstrated that 70% of all known meteorite falls originate from just three young asteroid families. These families were produced by three recent collisions that occurred in the main asteroid belt 5.8, 7.5, and about 40 million years ago. The team also revealed the sources of other types of meteorites; with this research, the origin of more than 90% of meteorites has now been identified. This discovery is detailed in three papers, a first published on 13 September 2024 in the journal Astronomy and Astrophysics, and two new papers published on 16 October 2024 in Nature.

Pic of the Week: The Launch of Hera

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Image (Credit): Visitors at ESA’s control center in Germany watching the Hera launch. (ESA / J.Mai)

This week’s image shows a crowd in Germany watching the launch of the European Space Agency’s (ESA) Hera mission on October 7, 2024. The launch itself took place from Cape Canaveral Space Force Station in Florida via a SpaceX Falcon 9.

Hera’s goal is to study how binary asteroid systems like Didymos form and function to learn more about to defend the Earth from approaching asteroids. You may remember Didymos from the earlier NASA Double Asteroid Redirection Test (DART) mission.

Here is more from the ESA on the mission:

Hera’s first deep space manoeuvre will begin in late October and put the spacecraft on course for its next major milestone, a flyby of Mars in March 2025. During this flyby, Hera will use its instruments to study Deimos, the smaller and more enigmatic of Mars’s two moons. This will serve as an important test for many of the spacecraft’s instruments, ensuring they are fully operational before the spacecraft arrives at its final destination, Didymos.

Hera will perform a second deep space manoeuvre in February 2026. An ‘impulsive rendezvous’ in October 2026 will bring Hera into the vicinity of the Didymos asteroid system. The spacecraft will begin its detailed survey of the moonlet Dimorphos in 2027, which will turn the 151 m asteroid into one of the most studied objects in the Solar System.

Space Stories: Oceans on Ariel, Dinosaur-Killer Asteroid from Beyond Jupiter, and the Launch of the Polaris Dawn Mission

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Image (Credit): Uranus and distant galaxies as seen by the James Webb Space Telescope. (NASA, ESA, CSA, STScI)

Here are some recent stories of interest.

—Forbes: “NASA’s Webb Telescope Finds Evidence For An Ocean World Around Uranus“

New observations by the James Webb Space Telescope suggest that an icy moon around Uranus may have an underground liquid ocean. Ariel is one of 27 moons around Uranus, the seventh planet from the sun and the third largest planet in the solar system. It’s one of four moons that scientists have long been interested in as part of a search for water across the solar system, the others being Umbriel, Titania and Oberon.

—Nature: “Dinosaur-killing Chicxulub Asteroid Formed in Solar System’s Outer Reaches“

The object that smashed into Earth and kick-started the extinction that wiped out almost all dinosaurs 66 million years ago was an asteroid that originally formed beyond the orbit of Jupiter, according to geochemical evidence from the impact site in Chicxulub, Mexico. The findings, published on 15 August in Science, suggest that the mass extinction was the result of a train of events that began during the birth of the Solar System. Scientists had long suspected that the Chicxulub impactor, as it is known, was an asteroid from the outer Solar System, and these observations bolster the case.

—Space Daily: “Polaris Dawn Mission Set for August 26 to Advance Commercial Space Exploration“

The Polaris Program, focused on testing and developing new spaceflight technology, is preparing to launch its first mission, Polaris Dawn, aboard SpaceX’s Falcon 9 rocket on Monday, August 26, 2024. This mission marks a significant step forward in commercial space exploration. Key objectives include testing a next-generation spacesuit during the first commercial spacewalk, attempting to achieve the highest altitude for a human spaceflight since the Apollo missions, and evaluating a new communication system through Starlink.