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A group of meteorites come from 1 single planetesimal

The meteorites suggest astronomers may have small, early planets wrong.

Image source: Madhuvan Yadav/Unsplash
Surprising Science
  • A group of meteorites that have come down all over the Earth have something in common.
  • They all come from one early-universe baby planet, or planetesimal.
  • That planetesimal was apparently not what astronomers expected.

Before planets formed, astronomers believe, there were lots of mini-planets, or planetesimals, many of which eventually broke apart — they're believed to be the source of meteorites that strike Earth. Perhaps surprisingly, a group of meteorites all around the globe come from the very same planetesimal. Not only is that a bit weird, but the evidence suggests that this former baby planet was not what scientists thought a planetesimal could be.

The research, "Meteorite evidence for partial differentiation and protracted accretion of planetesimals," is published in ScienceAdvances. The research was partially funded by NASA.

Planetesimals

Image source: Maria Starovoytova/Shutterstock

Some things are pretty much known about planetesimals. First, it's believed that they formed out of the swirling mass of gas and dust that was our universe roughly 4.5 billion years ago. As the universe cooled, bits began to crash into each other, forming these small bodies. It's been thought that they formed quickly as these things go — in less than a few million years.

Early planetesimals, forming in the first 1.5 billion years of our solar system, would have pulled in radiogenic materials from the hot universe. This material gave off heat as it decayed, and so the cosmic rubble comprising these planetesimals was melted into a relatively homogeneous achondritic mass. Radiogenic materials would less available to planetesimals formed later, and their rubble, though merged into a planetesimal, would be unmelted, or chondritic.

There may have been planetesimals that formed in the middle period, between early and late. The study notes, "This could have resulted in partially differentiated internal structures, with individual bodies containing iron cores, achondritic silicate mantles, and chondritic crusts." However, there's been little evidence of such "intermediate" planetesimals.

Until now, it's been basically a binary proposition: melted or unmelted. Which gets us to the family of meteorites.

IIE irons

Image source: Carl Agee, Institute of Meteoritics, University of New Mexico/MIT News

When meteorites are found and studied, the type of planetesimal from which they came is usually clear: melted or unmelted. Not so a family of meteorites called the "IIE irons." (IIE is their chemical type.)

As study co-author Benjamin Weiss of MIT's Department of Earth, Atmospheric, and Planetary Sciences (EAPS) explains, "These IIE irons are oddball meteorites. They show both evidence of being from primordial objects that never melted, and also evidence for coming from a body that's completely or at least substantially melted. We haven't known where to put them, and that's what made us zero in on them."

Researchers had previously established that all of these IIE iron outliers — which themselves can be either achondritic or chondritic — came from the same planetesimal, and that raises some intriguing questions.

As study lead author Clara Maurel, a grad student at EAPS, puts it, "This is one example of a planetesimal that must have had melted and unmelted layers." Did that baby planet perhaps have a solid crust over a liquid mantle? "[The IIE irons encourage] searches for more evidence of composite planetary structures," she says. "Understanding the full spectrum of structures, from nonmelted to fully melted, is key to deciphering how planetesimals formed in the early solar system."

Back to the planetesimal

Image source: Maurel, et al

One particularly interesting question was this, says Maurel: "Did this object melt enough that material sank to the center and formed a metallic core like that of the Earth? That was the missing piece to the story of these meteorites."

If that was the case, the scientists reasoned, mightn't such a core generate a magnetic field in the same way that Earth's core does? Some minerals in the planetesimal might have become oriented in the direction of the field, similarly to the way a compass works here. And if all that's the case, those same minerals in the IIE irons might still retain that orientation.

The researchers acquired two of the IIE iron meteorites, named Colomera and Techado, in which they detected iron-nickel minerals known for their ability to retain magnetic properties.

The team took their meteorites to the Lawrence Berkeley National Laboratory for analysis using the lab's Advanced Light Source that can detect minerals' magnetic direction using X-rays that interact with their grains.

The electrons in both IIE irons were pointed in the same direction, providing additional confirmation of their common source and suggesting their planetesimal indeed had a magnetic field, and it roughly equivalent in size to the Earth's.

The simplest explanation for the effect was that the planetesimal had a liquid metallic core that would have been a minimum of tens of kilometers wide. This implication suggests that previous assumptions regarding the speedy formation of planetesimals is, at least in the case of this one, wrong. This planetesimal must have formed over the course of several million years.

Back to the IIE irons

Colomera and Techado roughly agree on their planetesimal's cooling pattern.

Image source: Maurel, et al

All of this got the researchers wondering where in this surprisingly complex planetesimal the meteorites might've come from. They partnered with scientists from the University of Chicago to develop models of how this all might've gone down.

Maurel's team came to suspect that after the planetesimal cooled down and imprinted the magnetic field on the minerals, collisions with other bodies tore them away. She hypothesizes, "As the body cools, the meteorites in these pockets will imprint this magnetic field in their minerals. At some point, the magnetic field will decay, but the imprint will remain. Later on, this body is going to undergo a lot of other collisions until the ultimate collisions that will place these meteorites on Earth's trajectory."

It's impossible to know for now whether the planetesimal that produced the IIR irons was unusual, or if its history is typical for planetesimals. If so, the simple melted/unmelted dichotomy needs to be reconsidered.

"Most bodies in the asteroid belt appear unmelted on their surface. If we're eventually able to see inside asteroids," says Weiss, "we might test this idea. Maybe some asteroids are melted inside, and bodies like this planetesimal are actually common."

The Anthropause is here: COVID-19 reduced Earth's vibrations by 50 percent

The planet is making a lot less noise during lockdown.

Photo by Eric Rojas/Getty Images
Coronavirus
  • A team of researchers found that Earth's vibrations were down 50 percent between March and May.
  • This is the quietest period of human-generated seismic noise in recorded history.
  • The researchers believe this helps distinguish between natural vibrations and human-created vibrations.
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Dinosaurs suffered from cancer, study confirms

A recent analysis of a 76-million-year-old Centrosaurus apertus fibula confirmed that dinosaurs suffered from cancer, too.

Surprising Science
  • The fibula was originally discovered in 1989, though at the time scientists believed the damaged bone had been fractured.
  • After reanalyzing the bone, and comparing it with fibulas from a human and another dinosaur, a team of scientists confirmed that the dinosaur suffered from the bone cancer osteosarcoma.
  • The study shows how modern techniques can help scientists learn about the ancient origins of diseases.
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