What was the first object to form in your solar system when a nebula collapsed?

Answer 1

The most widely accepted scientific explanation for the formation of the Solar System is called the Solar Nebular Model. According to this model, the entire Solar System formed around 4.5 billion years ago from the gravitational collapse of a small fraction of a giant molecular cloud, also known as a nebula.

A disturbance, most likely a nearby supernova, caused a giant cloud of gas and dust floating in space to contract and begin to collapse on itself. Most of the gas collected in the center to form a gaseous sphere that would eventually become the Sun. As more gas was drawn inward by the force of gravity, friction and pressure caused this sphere, called a protostar, to become hot and start to glow.

As the nebula continued to contract, conservation of angular momentum caused it to spin faster. It flattened out into a protoplanetary disk, with the hot, dense protostar in the center. Over millions of years, all eight planets formed by accretion from this disk. In other words, gravity pulled the disk into many clumps of gas and dust. These clumps stuck together and grew larger and larger, turning into planetesimals. The planetesimals further coalesced to eventually form planets, with comets and asteroids being the leftovers. Gravitational interaction with the planets caused them to be grouped into distinct regions such as the asteroid belt and Kuiper belt.

Due to their higher boiling points only metals and silicates could exist in the warm inner solar system, and these would form the rocky planets of Mercury, Venus, Earth, and Mars. Since metallic elements only comprised a very small fraction of the solar nebula, the terrestrial planets could not grow very large. It is thought that as many as 100 small protoplanets used to exist in the inner solar system, but they eventually collided and merged to create the four inner planets we know today.

The gas giants (Jupiter, Saturn, Uranus, and Neptune) formed further out, beyond the frost line where icy compounds can remain solid. The gas and ice that formed the Jovian planets was more abundant within the protoplanetary disk, allowing them to become massive enough to gain large atmospheres of hydrogen and helium and grow to mammoth proportions. Uranus and Neptune are thought to have formed closer to the Sun, then migrated out to their current orbits.

Throughout all this, the infant Sun continued to grow hotter. Once the temperature and pressure at the core was high enough, thermonuclear fusion of hydrogen began, and the Sun became a fully fledged main-sequence star. Solar wind swept away the remaining gas and dust leftover from the protoplanetary disk into interstellar space, ending the growth of the planets. This entire process of solar system formation happened within several hundred million years and was finished by around 4.5 billion years ago.

Answer 2

by studying meteorites, scientists have been able to work out the age of the solar system itself: 4.6 billion years. At that time, a cloud of dust and gas drifted trough space. The cloud become a swirling disc of matter, with a center that became hotter and denser, eventually becoming the Sun. Particles of remaining dust clumped together and became boulders. These built up like snow balls into large balls of rock, finally becoming planets.

Answer 3

The Sun. The gas cloud that was falling into its own center gathered more and more hydrogen gas as it fell under gravity. When the proto-Sun was dense enough, hydrogen fusion in the core began and this sent a shock wave throughout the remainder of the gas cloud. This may have halted the collapse, and encouraged the heavier elements in the dust cloud to coalesce into planets and asteroids.

Answer 4

The scientific theory of the formation of the solar system is that about four and a half billion years ago, a large, rotating cloud of interstellar gas contracted under it's own gravitational attraction, forming the sun and all its satellite objects such as planets, comets, and asteroids (although it may be that the asteroids came later, as a result of a planet breaking up into pieces).

Answer 5

Planets in the solar system are formed by a gas from the sun. first it starts as a fire ball then it cools and then land form with water. i am in sixth grade for your information high scholars.

Answer 6

The very first step would have been the condensing of massive clouds of hydrogen, nitrogen etc that would have been the protostar that is now our sun. After enough material had condensed and enough heat was created the sun would have suddenly turned on and began shining. At this time is when the protoplanetary disc around the sun would have began forming smaller clumps of gases and metals and began forming the planets.

Answer 7

The six planets nearest the sun (Mercury through Saturn), easily visible to the naked eye,

were known to the ancients, from the time that living beings developed sufficient eyesight

and intelligence to notice objects in the sky from one night to the next.

The next three, invisible without telescopes, were discovered as follows:

Uranus . . . 1781

Neptune . . 1846

Pluto. . . . . 1930

Answer 8

The accretion theory is the most investigated to date, which suggests that stars and their planets form as whirling disks of matter within nebulae of gas left over from other stars, or from concentrations of interstellar gas within galaxies.

There are "young stars" formed very recently in these locations, which have apparently begun fusing hydrogen within the past few million years, as opposed to around 4 billion years ago for our Sun. According to this theory, there have been several overlapping populations of stars within the many galaxies since the Big Bang formed the first matter about 14 billion years ago.

Supporting the accretion theory is the common direction of planetary revolutions in their orbits, their similar spins, and the assortment of elements found throughout the various sizes of planets depending on their distance from the Sun. Many asteroids exhibit a gravity-driven clumping effect of their rock, ice, and gases that (given even larger collections of matter) could create planetesimals and even planets.

Studies of planets around distant young stars may yield more clues to the structure and dynamics of planetary formation.
All the planets in the solar system, as well as all the comets and asteroids, were formed from a disk of dust and gas known as the protoplanetary disk.

Shortly after the Sun formed from a cloud of gas called a nebula, the "leftover" dust and gas began to orbit the Sun due to the force of gravity. The leftovers flattened into a disk.

The dust particles in the disk began to clump together (again, because of gravity). These clumps grew larger and larger. They crashed into each other and fused together. What started as specks of dust grew into debris the size of cars, then houses, then skyscrapers. A few of these chunks of debris grew very large, large enough to take on spherical shapes. Eventually these became the eight planets of the solar system. All the smaller pieces of debris became the asteroids and comets.

This entire process probably took millions of years before the eight planets of the modern solar system emerged.
The planets were formed when a very dence adom (aka. The only thing existing at the time) became so dense that it burst causing the big bang, or if you are very religious like me then God made it in 6 days and rested on the 7th day.
some scientists think that a star may have exploded forming a large cloud of gas, dust, and ice. The density of the cloud became greater because of the material sticking together, this attracted more gravity causing masses to form and the cloud to become denser.

Answer 9

Scientists believe that the solar system formed from a cloud of dust and gas that had been gradually collecting in space, attracted by its own gravity. Some of the hydrogen gas had probably been floating in space since the Big Bang, but a lot of it is dust and gas that has been thrown back into space as the result of several, possibly very many, supernova explosions.

We know this because our Earth is made of iron and silicon and magnesium and lead and gold and uranium - atoms that ONLY form in the nuclear fusion of a star that is blasting itself apart.

But internal gravity doesn't seem to explain how a nebula can collapse to form a star and planets; there has to be some shock wave. There, too, we believe a supernova explosion probably did the trick; our solar system was formed of star-stuff by the shock wave of a dying star.

Answer 10

The solar system was formed 4.6 billion years ago. The incident that took place was that sun had some problem (due to which explosons took place in it) and threw out clouds of gas. While spinning aroud the sun they formed round objects that are now "socalled planets."