Solar nebular hypothesis | scholarly search


When the sun became luminous enough, the remaining gas and dust were blown away into space—leaving the planets orbiting the sun.

The Origin of the Solar System

The solar nebula theory

The solar nebula theory supposes that planets form in the rotating disks of gas and dust around young stars.
There is clear evidence that disks of gas and dust are common around young stars.
Bipolar flows from protostars were the first evidence of such disks.


Uranus never grew massive enough to capture large amounts of gas from the nebula as Jupiter and Saturn did.

The nebular hypothesis says that the Solar System ..

The hypothesis of Laplace on the genesis of the solar system from an extensive nebula ..

the solar nebula hypothesis, ..


Venus and Uranus are exceptions—they rotate on
their axes in that same direction.

According to the solar nebula hypothesis, Earth and the other planets of the solar system formed billions of years ago as the sun condensed from the interstellar medium.

How Was the Solar System Formed? - The Nebular Hypothesis

The important point is that Nichols has developed a tool for testing ideas for formation of the Solar System, which will help us understand star and planet formation in general.

The variation means either that some formed millions of years after the others, or that aluminum-26 was not distributed uniformly in the solar nebula.

Building Blocks of Life Found in Comet's Atmosphere

Scientists believe that the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star (called a ). This explosion made waves in space which squeezed the cloud of gas and dust. Squeezing made the cloud start to collapse, as gravity pulled the gas and dust together, forming a solar nebula. Just like a dancer that spins faster as she pulls in her arms, the cloud began to as it collapsed. Eventually, the cloud grew hotter and denser in the center, with a disk of gas and dust surrounding it that was hot in the center but cool at the edges. As the disk got thinner and thinner, particles began to stick together and form clumps. Some clumps got bigger, as particles and small clumps stuck to them, eventually forming or . Near the center of the cloud, where planets like formed, only rocky material could stand the great heat. Icy matter settled in the outer regions of the disk along with rocky material, where the giant planets like formed. As the cloud continued to fall in, the center eventually got so hot that it became a star, the Sun, and blew most of the gas and dust of the new solar system with a strong . By studying meteorites, which are thought to be left over from this early phase of the solar system, scientists have found that the solar system is about 4600 million years old!

How Good are those Young-Earth Arguments: Hovind's …

Several radiometric systems can be used on CAIs, including:Both systems indicate that CAIs began forming roughly two million years prior to chondrules (at roughly 4.571 ga). But note: The uniformity of these ages implies that they formed through the same underlying process. The only reasonable hypothesis is that they condensed from the Solar Nebula.

However, there is some evidence that two isotopes, aluminum-26 and manganese-53, were not distributed uniformly in the solar nebula.

Solar System Formation - |LASP|CU-Boulder

Solar Nebula Hypothesis: The in our solar system was formed out of the primordial solar nebula. The belt's planetesimals never condensed into a planet, probably due to gravitational perturbations from Jupiter. This explanation of the origin of the asteroid belt is currently accepted by most mainstream astronomers.

The widely accepted modern variant of the nebular hypothesis is the solar ..

The Exploded Planet Hypothesis – 2000

At some point all of the gas that was left in the solar nebula was blown away, probably when the Sun went through a phase of strong out-flowing wind (which is observed in newly-formed stars similar to the Sun).

This would mean that the solar nebula lasted at least several half lives ..

Solar System - New World Encyclopedia

The Allende meteorite, among others, contains Calcium-aluminum-rich inclusion - CAIs - little giblets of refractory material that are not chondrules. How did they form? There are two hypotheses:
Fortunately, meteorite geochemistry enables us to choose the more reasonable hypothesis: If CAIs formed during the first condensation of the early Solar Nebula, we would expect their ages to be similar and uniform. If they originated in older solar systems, there would be no reason to expect them to have similar ages.