Nav: Home

Scientists estimate solar nebula's lifetime

February 10, 2017

About 4.6 billion years ago, an enormous cloud of hydrogen gas and dust collapsed under its own weight, eventually flattening into a disk called the solar nebula. Most of this interstellar material contracted at the disk's center to form the sun, and part of the solar nebula's remaining gas and dust condensed to form the planets and the rest of our solar system. Now scientists from MIT and their colleagues have estimated the lifetime of the solar nebula -- a key stage during which much of the solar system evolution took shape.

This new estimate suggests that the gas giants Jupiter and Saturn must have formed within the first 4 million years of the solar system's formation. Furthermore, they must have completed gas-driven migration of their orbital positions by this time.

"So much happens right at the beginning of the solar system's history," says Benjamin Weiss, professor of earth, atmospheric, and planetary sciences at MIT. "Of course the planets evolve after that, but the large-scale structure of the solar system was essentially established in the first 4 million years."

Weiss and MIT postdoc Huapei Wang, the first author of this study, report their results today in the journal Science. Their co-authors are Brynna Downey, Clement Suavet, and Roger Fu from MIT; Xue-Ning Bai of the Harvard-Smithsonian Center for Astrophysics; Jun Wang and Jiajun Wang of Brookhaven National Laboratory; and Maria Zucolotto of the National Museum in Rio de Janeiro.

Spectacular recorders

By studying the magnetic orientations in pristine samples of ancient meteorites that formed 4.563 billion years ago, the team determined that the solar nebula lasted around 3 to 4 million years. This is a more precise figure than previous estimates, which placed the solar nebula's lifetime at somewhere between 1 and 10 million years.

The team came to its conclusion after carefully analyzing angrites, which are some of the oldest and most pristine of planetary rocks. Angrites are igneous rocks, many of which are thought to have erupted onto the surface of asteroids very early in the solar system's history and then quickly cooled, freezing their original properties -- including their composition and paleomagnetic signals -- in place.

Scientists view angrites as exceptional recorders of the early solar system, particularly as the rocks also contain high amounts of uranium, which they can use to precisely determine their age.

"Angrites are really spectacular," Weiss says. "Many of them look like what might be erupting on Hawaii, but they cooled on a very early planetesimal."

Weiss and his colleagues analyzed four angrites that fell to Earth at different places and times.

"One fell in Argentina, and was discovered when a farm worker was tilling his field," Weiss says. "It looked like an Indian artifact or bowl, and the landowner kept it by this house for about 20 years, until he finally decided to have it analyzed, and it turned out to be a really rare meteorite."

The other three meteorites were discovered in Brazil, Antarctica, and the Sahara Desert. All four meteorites were remarkably well-preserved, having undergone no additional heating or major compositional changes since they originally formed.

Measuring tiny compasses

The team obtained samples from all four meteorites. By measuring the ratio of uranium to lead in each sample, previous studies had determined that the three oldest formed around 4.563 billion years ago. The researchers then measured the rocks' remnant magnetization using a precision magnetometer in the MIT Paleomagnetism Laboratory.

"Electrons are little compass needles, and if you align a bunch of them in a rock, the rock becomes magnetized," Weiss explains. "Once they're aligned, which can happen when a rock cools in the presence of a magnetic field, then they stay that way. That's what we use as records of ancient magnetic fields."

When they placed the angrites in the magnetometer, the researchers observed very little remnant magnetization, indicating there was very little magnetic field present when the angrites formed.

The team went a step further and tried to reconstruct the magnetic field that would have produced the rocks' alignments, or lack thereof. To do so, they heated the samples up, then cooled them down again in a laboratory-controlled magnetic field.

"We can keep lowering the lab field and can reproduce what's in the sample," Weiss says. "We find only very weak lab fields are allowed, given how little remnant magnetization is in these three angrites."

Specifically, the team found that the angrites' remnant magnetization could have been produced by an extremely weak magnetic field of no more than 0.6 microteslas, 4.563 billion years ago, or, about 4 million years after the start of the solar system.

In 2014, Weiss' group analyzed other ancient meteorites that formed within the solar system's first 2 to 3 million years, and found evidence of a magnetic field that was about 10-100 times stronger -- about 5-50 microtesla.

"It's predicted that once the magnetic field drops by a factor of 10-100 in the inner solar system, which we've now shown, the solar nebula goes away really quickly, within 100,000 years," Weiss says. "So even if the solar nebula hadn't disappeared by 4 million years, it was basically on its way out."

The planets align

The researchers' new estimate is much more precise than previous estimates, which were based on observations of faraway stars.

"What's more, the angrites' paleomagnetism constrains the lifetime of our own solar nebula, while astronomical observations obviously measure other faraway solar systems," Wang adds. "Since the solar nebula lifetime critically affects the final positions of Jupiter and Saturn, it also affects the later formation of the Earth, our home, as well as the formation of other terrestrial planets."

Now that the scientists have a better idea of how long the solar nebula persisted, they can also narrow in on how giant planets such as Jupiter and Saturn formed. Giant planets are mostly made of gas and ice, and there are two prevailing hypotheses for how all this material came together as a planet. One suggests that giant planets formed from the gravitational collapse of condensing gas, like the sun did. The other suggests they arose in a two-stage process called core accretion, in which bits of material smashed and fused together to form bigger rocky, icy bodies. Once these bodies were massive enough, they could have created a gravitational force that attracted huge amounts of gas to ultimately form a giant planet.

According to previous predictions, giant planets that form through gravitational collapse of gas should complete their general formation within 100,000 years. Core accretion, in contrast, is typically thought to take much longer, on the order of 1 to several million years. Weiss says that if the solar nebula was around in the first 4 million years of solar system formation, this would give support to the core accretion scenario, which is generally favored among scientists.

"The gas giants must have formed by 4 million years after the formation of the solar system," Weiss says. "Planets were moving all over the place, in and out over large distances, and all this motion is thought to have been driven by gravitational forces from the gas. We're saying all this happened in the first 4 million years."
This research was supported, in part, by NASA and a generous gift from Thomas J. Peterson, Jr.

Brookhaven National Laboratory is supported by the Office of Science of the U.S. Department of Energy. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit

NOTE: This news release was issued on February 9, 2017 by MIT News. Physicist Jun Wang and former postdoc (now scientific associate) Jiajun Wang of the U.S. Department of Energy's (DOE) Brookhaven National Laboratory contributed to the research. Using transmission x-ray microscopy (TXM) nanoimaging, they identified and characterized the chemical composition and the grain size of magnetic particles within ancient igneous meteorites. The analyses provided accurate estimates of the intensities of the early solar system's magnetic fields (as preserved in the meteorites); this information is key to setting the time scale of the evolution of the solar nebula--the cloud of dust and gas particles thought to be behind the development of our solar system--and the formation of planets. The TXM data were collected at Brookhaven's National Synchrotron Light Source (NSLS) and the Advanced Photon Source (APS) at DOE's Argonne National Laboratory through the NSLS-II TXM transition program. The TXM instrument was temporarily relocated to APS in 2015 when NSLS was replaced by NSLS-II. The instrument will remain at APS until its new beamline at NSLS-II is constructed. NSLS-II (and the former NSLS) and APS are DOE Office of Science User Facilities.

DOE/Brookhaven National Laboratory

Related Magnetic Field Articles:

Understanding stars: How tornado-shaped flow in a dynamo strengthens the magnetic field
A new simulation based on the von-Kármán-Sodium (VKS) dynamo experiment takes a closer look at how the liquid vortex created by the device generates a magnetic field.
'Quartz' crystals at the Earth's core power its magnetic field
Scientists at the Earth-Life Science Institute at the Tokyo Institute of Technology report in Nature (Fen.
Brightest neutron star yet has a multipolar magnetic field
Scientists have identified a neutron star that is consuming material so fast it emits more x-rays than any other.
Confirmation of Wendelstein 7-X magnetic field
Physicist Sam Lazerson of the US Department of Energy's Princeton Plasma Physics Laboratory has teamed with German scientists to confirm that the Wendelstein 7-X fusion energy device called a stellarator in Greifswald, Germany, produces high-quality magnetic fields that are consistent with their complex design.
High-precision magnetic field sensing
Scientists have developed a highly sensitive sensor to detect tiny changes in strong magnetic fields.
Brilliant burst in space reveals universe's magnetic field
Scientists have detected the brightest fast burst of radio waves in space to date -- locating the source of the event with more precision than previous efforts.
Optical magnetic field sensor can detect signals from the nervous system
The human body is controlled by electrical impulses in the brain, the heart and nervous system.
What did Earth's ancient magnetic field look like?
New work from Carnegie's Peter Driscoll suggests Earth's ancient magnetic field was significantly different than the present day field, originating from several poles rather than the familiar two.
Just what sustains Earth's magnetic field anyway?
Earth's magnetic field shields us from deadly cosmic radiation, and without it, life as we know it could not exist here.
Ironing out the mystery of Earth's magnetic field
The Earth's magnetic field has been existing for at least 3.4 billion years thanks to the low heat conduction capability of iron in the planet's core.

Related Magnetic Field Reading:

Best Science Podcasts 2019

We have hand picked the best science podcasts for 2019. Sit back and enjoy new science podcasts updated daily from your favorite science news services and scientists.
Now Playing: TED Radio Hour

Don't Fear Math
Why do many of us hate, even fear math? Why are we convinced we're bad at it? This hour, TED speakers explore the myths we tell ourselves and how changing our approach can unlock the beauty of math. Guests include budgeting specialist Phylecia Jones, mathematician and educator Dan Finkel, math teacher Eddie Woo, educator Masha Gershman, and radio personality and eternal math nerd Adam Spencer.
Now Playing: Science for the People

#518 With Genetic Knowledge Comes the Need for Counselling
This week we delve into genetic testing - for yourself and your future children. We speak with Jane Tiller, lawyer and genetic counsellor, about genetic tests that are available to the public, and what to do with the results of these tests. And we talk with Noam Shomron, associate professor at the Sackler School of Medicine at Tel Aviv University, about technological advancements his lab has made in the genetic testing of fetuses.