This rotating disk of dust and gas became the "solar nebula".

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!

Probable sequence of steps in the formation of the solar system.

 The Orion Nebula, an interstellar cloud in which starsystems and possibly planets are forming.

(b) Dust particles from the nebula settle onto a disc.

Pressure caused the cloud of gas and dust, known as a nebula, to begin collapsing and gravity forced the dust and gas together to cause a solar nebula.

The hydrogen and helium could have been blown away by the solar wind.

These compounds arrived in the inner planets after their initial formation,most likely brought by impacts of planetesimals formed in the outskirtsof the solar system .

There are no direct methods to observe the formational process of theSolar System

The Nebular Hypothesis - YouTube

Because temperatures within the disk varied with distance from the center of the nebula, different materials condensed at different locations within the disk.

06/10/2011 · Nebular Hypothesis - Origin of the ..

The oldest rocks on Earth are about 3.9 billions years old. There are not very many of such old rocks around since the surface of the Earth has been thoroughly resurfaced. The oldest lunar rocks are about 4.4 billion years old. The oldest rocks ever encountered are meteorites, some of which are as old as 4.6 billion years. These meteorite rocks are thought to have formed during the early condensation of the solar nebula. The planets formed about 0.1 billion (100 million) years later. So, the age of the Earth is probably close to about 4.5 billion years.

Nebular Hypothesis - Formation of the Solar System - Duration: ..

Here we are happily talking about the solar system being 4.5 billion years old, but how do wethat the solar system is this old? What is the scientific evidence? The main evidence comes from radioactivity. A few elements are unstable and are likely to "decay" - that is, emit a particle and become a different element. For example, an isotope of potassium (potassium-40) decays to an isotope of argon (argon-40) with a half-life of 1.3 billion years. This means that 1 kilogram of pure potassium-40 would, over 1.3 billion years, turn into 1/2 a kilogram of argon-40 and 1/2 kilogram of remaining potassium-40. Then, another 1.3 billion years later, the 1/2 kilogram of potassium-40 reduces to 1/4 kilogram and another 1/4 kilogram of argon-40. Therefore, we can find out the age of a lump of rock by measuring the ratio of potassium-40 to argon-40 - see figure 8.17.

Formation and evolution of the Solar System - Wikipedia

The recent collision between comet Shoemaker-Levy and Jupiter also gave us a glimpse at what probably happened on a much grander scale when the solar system was very young.

Nebular hypothesis - definition of nebular hypothesis …

These bursts sweep light elements such as hydrogen out of the outer solar system and into the solar system where it is swept up by the distant outer planets.

solar nebula hypothesis by Alexander Loya on Prezi

(a) Gravitational contraction of a rotating gas cloud leads to a dense central region (eventually forming the Sun) and a more diffuse, flattened nebula.