Amateur Astronomer Thinks Fast, Preserves Meteorite With Evidence Of Early Life

This week, NASA announced new findings from the Hillsborough meteorite that crashed to Earth in 2024. The meteorite’s remarkably pristine condition allowed the organization to study it in great detail, revealing new chemical evidence about the nature of so-called primitive asteroids and, through that, the possible origins of life.

The reason the asteroid was so well-preserved was that it crashed through the roof of an extremely sharp New Jersey couple, one of whom was an amateur astronomer. They immediately realized what had very nearly fallen into their laps, and donned gloves for handling the rocks before scrounging up enough glass jars to contain all the fragments.

The glass jars were sealed with tin-foil, and overall the move helped preserve delicate minerals and organic compounds that are often altered by moisture, weather, and contamination.

Thanks to this, scientists were able to discern fine chemical details in the space-rock, including the presence of a surprising amount of sodium. The Hillsborough meteorite is thought to be from a CM carbonaceous chondrites, which are not associated with that level of sodium, and so NASA decided to look closer.

Using powerful electron microscopes, NASA managed to discern the history of the meteorite. They saw microscopic fractures filled with sodium-rich materials that were likely left behind by ancient brines. It was only the way in which the samples were collected and stored that allowed this, since these sodium-carbonate salts are very fragile; normally, they react with moisture in the air and are long gone by the time scientists attempt to study them.

Left: A back-scattered electron image with two C1 748 clasts circled. Right: An X-ray map of the same area, indicating sodium enrichment.
Credit: NASA

Brines are important because they contain dissolved salts that allow them to transport elements and chemically alter rock. In the Hillsborough meteorite, ancient brines left tell-tale signs that have been preserved in rock for billions of years.

This helps to explain the diversity of organic compounds found on these rare carbonaceous meteorites. Brines can facilitate the distributions of phosphates, which can catalyze chemical reactions between organics and precipitate minerals. That makes the organic chemistry going on inside certain asteroids far more active than previously predicted.

In general, the Hillsborough meteorite findings strengthen the assumption that complex organic compounds are common on carbonaceous asteroids, and through that the assumption that early Earth could have been seeded with organic molecules necessary for the beginning of life.

There is another way to interpret the findings, however. While they do strengthen the long-standing argument that life-critical molecules could have gotten to Earth on an asteroid, they also strengthen the argument that such molecules wouldn’t have needed to arrive in that way. If complex organic chemistry can happen in the center of an asteroid, in defiance of all predictions, then certainly it would be possible in the much more diverse context of primordial Earth.

The Hillsborough meteorite is just the second meteorite of its type ever discovered, making it of huge scientific importance. You can be sure that the samples, well-preserved as the are, will be studied to produce many more insights, in the future.