We can't be certain of the exact sequence of events, but there are a few things we're pretty sure of. Because the Earth is made of iron, and silicon, and lead and gold and uranium, we know that the Earth and our solar system are "third generation", or later; we formed from the wreckage of earlier stars that went supernova. Supernova explosions are the ONLY way that these heavy elements can be formed. It probably took more than one supernova to create the heavy elements we find here.
From the gas and dust existing in space and thrown off from the supernovae, a nebula formed, and gradually began to condense under the influence of gravity. Here's where it gets interesting. Mathematical simulations of a condensing nebula doesn't seem to generate a solar system - UNLESS an external shock wave causes it to collapse. So it probably took one more supernova, and not too far away, to cause our solar system to form when it did.
Gravity.
The most likely scenario is that a nearby nova caused pressure waves in the interstellar medium, resulting in spots of critical density within the nebula, that then continued to collapse in on themselves.
The formation and evolution of the Solar System is estimated to have begun 4.6 billion years ago with the gravitational collapse of a small part of a giant molecular cloud. Most of the collapsing mass collected in the centre, forming the Sun, while the rest flattened into a protoplanetary disc out of which the planets, moons, asteroids, and other small Solar System bodies formed.
Gas and dust that make up nebula are made of matters. The matters of nebula are held together by gravity. There are lots of space in nebula between the particles. Gravitational attraction between the particles keeps them from drifting apart in a sphere.
The solar nebulae formed when the Universe was still in its first stages. A nebula is an interstellar cloud in outer space that is made up of dust, hydrogen and helium gas, and plasma. It is formed when portions of the interstellar medium collapse and clump together due to the gravitational attraction of the particles that comprise them.
a.All the planets' orbits lie roughly in the same plane.b.The Sun's rotational equator lies nearly in this plane.c.Planetary orbits are slightly elliptical, very nearly circular.d.The planets revolve in a west-to-east direction. The Sun rotates in the same west-to-east direction.e.The planets differ in composition. Their composition varies roughly with distance from the Sun: dense, metal-rich planets are in the inner part and giant, hydrogen-rich planets are in the outer part.f.Meteorites differ in chemical and geologic properties from the planets and the Moon.g.The Sun and most of the planets rotate in the same west-to-east direction. Their obliquity (the tilt of their rotation axes with respect to their orbits) are small. Uranus and Venus are exceptions.h.The rotation rates of the planets and asteroids are similar---5 to 15 hours, unless tides slow them down.i.The planet distances from the Sun obey Bode's law---a descriptive law that has no theoretical justification. However, Neptune is a significant exception to Bode's "law" .j.Planet-satellite systems resemble the solar system.k.The Oort Cloud and Kuiper Belt of comets.l.The planets contain about 90% of the solar system's angular momentum but the Sun contains over 99% of the solar system's mass.
conservation of energy,
as the pressure rises, the temp rises
Gravity
And whatever caused the Big Banger
It flattened as a natural consequence of collisions between particles in the nebula, changing random motions into more orderly ones.
When a gas contracts, its temperature will increase. In this case, the gas contracts due to the gravitation.
Gravity keeps the planets in orbit around the sun and the stars and the stars in orbit around the center of the galaxy. Gravity also holds the stars together against their own internal pressure.
gravity is something that can affect the planets.
the planets were formed by gravity because starts had gravity around them witch caused them to become bigger and be planets i think.. idk
Gravity is the force which directs the path of the planets.
If sun's gravity suddenly disappears then the planets will stop to revolve around the sun after some time and this duration is equal to the time taken by the light to reach from sun to other planets. For e.g. Time taken by earth to stop revolving and flying off in any direction = Time taken by light to earth from sun = 8 min. 20 seconds Also, planets will start to fly in any direction and they may collapse and in simple words: Solar system will collapse and life will disappear on earth.
Gravity keeps the planets in orbit around the sun and the stars and the stars in orbit around the center of the galaxy. Gravity also holds the stars together against their own internal pressure.
Planets have gravity because they have mass.
The other planets do have gravity.
gravity is something that can affect the planets.
Yes. All planets have gravity. Earth is one of those inner planets.
The premise of this question is incorrect; all planets have gravity.
No. Planets have gravity as a result of their own mass.
the planets were formed by gravity because starts had gravity around them witch caused them to become bigger and be planets i think.. idk
Yes they are the sun has gravity that holds the planets in place.
Not all of the planets are held by gravity.
Gravity is the force which directs the path of the planets.
If sun's gravity suddenly disappears then the planets will stop to revolve around the sun after some time and this duration is equal to the time taken by the light to reach from sun to other planets. For e.g. Time taken by earth to stop revolving and flying off in any direction = Time taken by light to earth from sun = 8 min. 20 seconds Also, planets will start to fly in any direction and they may collapse and in simple words: Solar system will collapse and life will disappear on earth.