Which object is formed last in our solar system?
Last object(s) formed in our solar system:
The planetesimals were formed last in our solar system, according to many theories and scientists.
The correct sequence or you can say order in which the objects were formed in the solar system is as below:
- the Sun
- the solar nebula
- the inner planets
- the planetesimals
What is the solar system? How did it form?
To answer the above question, there’re plenty of theories. Most interestingly, each religion has its own thinking regarding planets and space (solar system). Moreover, this becomes sometimes controversial for discussion among different religious scholars and followers. However, according to scientists, almost 4.5 billion years ago, the gravity in space pulled out the cloud of dust and gas. After the pulling of dust and gases from gravity, our solar system was formed. The scientist gave this attraction of pulling the name of “Big Bang theory.”
Despite this estimated process, those who study space and solar systems also gave three models of the formation of our planets and solar system. And we’ll be discussing these 3 formulation models in the next part of this article. Stay till the end to read other important parts of this blog post.
Formation of planets in our solar system – Formation models
Now that’s the part you all were waiting for!!! Thanks for staying till here to get your answer.
Scientists have given the formation models to explain how and when the planets in our solar system have formed. There’re three widely models acceptable worldwide that give the idea of the formation of the solar system. Some claimed these models as theories for the formation of the solar system. Anyhow, there are 3 basic, so-called models that reveal the formations of the planets. Out of these three models, the first model is widely acceptable by scientists, i.e. the core accretion model. So with no further late, let begin the most important part of this blog.
The three models are given below, along with in-depth details.
- The core accretion model:
According to this model, about 4.6 billion years ago there was a gravitational pull of a cloud of dust and gases – solar nebula. This model also emphasized that the solar nebula was a mixture of clouds of dust and gas prior to the solar system. After the gravity forced to collapse the material in on itself, it spun and the sun came into the center of the nebula.
In the very next step of this model, it gives the process of how asteroids, planets, moon, and other comets were formed. As per the model, after the rise of the sun as mentioned above, other materials started to clump together. The small rocky materials, or particles, then formed into bigger materials and particles. In addition to this, the solar winds blew away lighter and smaller elements, such as hydrogen and helium, and leaving only heavy or large rocky materials. These heavier, larger, and rockier materials gave birth to new planets.
On the other hand, some firm observations further confirm the model of core accretion. Similarly, stars with more metals – elements other than hydrogen and helium, have more massive planets to their metal-poor cousins. However, as per the reports of NASA, the core accretion model claims that the light, small, particles are more common than the bigger gas giants.
Furthermore, in 2005, the discovery of a giant or big planet with a larger core that orbit around the sun-like star – HD 149026 helped to further speed up this model.
- The disk instability model:
In the previous model, there’re few flaws that’s why the next model was needed to overcome this flaw. For example, the quick formation of giant gas planets wasn’t in the above process, as the process takes several million ears for the formation of these planets. Meanwhile, the core accretion process also faced the problem of migration because so-called baby planets are likely to move towards the sun in a short period of time.
Anyhow, the next model – disk instability suggested that the clumps of dust and gas are bound together in such a way that after some years they formed into a giant planet. Moreover, unlike core accretion, disk instability didn’t take millions of years. In fact, according to scientists, this process took approximately 1000 years, which is way too short as millions of years. The planets formed through the process of disk instability are more likely to reach an orbit-stabilizing mass quickly as compared to core accretion. An orbit-stabilizing is a process that keeps the planets from death-marching into the sun.
- Pebble accretion:
As mentioned above models, the main issues were mostly time. Therefore, the scientists came up with the rapid model that was almost 1000 times quicker than its predecessors (models). The pebble-sized structures fused together to form a massive planet, according to this model.
For instance, two researchers namely Michiel Lambrechts and Anders Johansen from Lund University in Sweden, conducted research. In their research, both the scientists proposed that small or tiny pebble-shaped materials or structures are responsible for the building of larger planets.
What are planetary systems?
The planetary systems are those systems of planets that have proper planet-shaped materials and orbit around a specific host star. In the case of our solar system, it is also a planetary system, having eight planets revolving around a sun – host star.
Honestly, there are several planetary systems in the entire universe; some are unidentified and undiscovered too.
As we all know, our system of the planet is known as the “solar system”, with the specific host star called as “Sun.” Since the “Sun” comes from the Latin word “Sol”, which means “soils”, therefore, we named our planetary system “solar system.” Moreover, we also called any sun-related thing to “solar.”
How many planets are there in our solar system?
To simply answer this question, there are eight planets in our solar system. However, in-depth details confirm that there are plenty of stars revolving around the Sun, but bound b the gravity of it. The planets include:
- Mercury
- Venus
- Earth
- Mars
- Saturn
- Uranus
- Neptune
- Pluto (dwarf planet)
Other than planets, there are also several and dozens of moons, millions of asteroids, meteoroids, and comets.
Which event led to the formation of our solar system?
To be honest, there’re several theories that claim the formation of the solar system and its planets. Among the theories, only one theory is widely accepted and gives logic to know about the event that led to the formation of our solar system.
In the below section, we’ll be discussing that theory that led to the formation of today’s planet. So, come to the next part of this headline.
Formation of the solar system theories:
Our solar system was formed about 4.5 million years ago, as estimated by scientists. As we discussed earlier in our article, there are eight planets in the solar system, rather than nine because we do not longer consider Pluto as a planet, but it’s a dwarf planet.
- Big Bang Theory:
Among other theories presented b scientists, only the “Big Bang Theory” is widely accepted. According to this theory, about 4.5 billion years ago, an explosion occurred in the sun. As a result, several parts of the sun broke and separated from it and start revolving around it, but in specific orbits. These broken and separated parts of the sun are today’s planets of the solar system.
In this way, our solar system was created along with the other eight planets.
- Other theories related to the formation of planets and moons of the universe:
On the other hand, other researchers and scientists believed that our universe, a solar system to be précised, was formed after the explosion of a supernova – a near star. Moreover, a cloud of gas and dust was disturbed, leading to the formation of solar planets. Furthermore, after the explosion, the cloud of gas and dust was squeezed by the waves produced by the explosion. After the squeezing process, gravity collected both materials and made them one – solar nebula.
After gathering and collecting, the clouds grew hotter and heavier in the center. Interestingly, the clouds had a disk, which was hot in the center and cold at the edges. From time to time, those disks became thinner and thinner and the tiny structures gathered together to form clumps. Eventually, some of the clumps became so massive that other small materials and clumps stuck to them, leading to the formation of several stars, planets, and moons.
Where is our solar system in the Milky Way Galaxy?
Before answering the question, you need to know what actually the Milky Way Galaxy is. In other words, what is meant by Galaxy?
To answer the above question, one thing you should remain in your mind is that our earth is located in the solar system, and our solar system is situated in one of the thousands of Galaxies- the Milky Way Galaxy. So, the Milky Way Galaxy is one of the thousands of galaxies in the universe. This galaxy is the home for further thousands of other planetary systems, planets, and stars.
The solar system, a planetary system to be précised, is situated in an outer spiral arm of the Milky Way galaxy. Also, this is also known as the “Orion Arm”. Besides our solar system, researchers and scientists have discovered thousands of other these types of planets systems in the Milky Way Galaxy where our earth, solar system to be précised, is situated.
How old is our solar system?
Well, you’ve come to know about the entire solar system, but one thing still remains confused. The unknown or confusing thing is regarding the exact age of the solar system. We have discussed in the initial part of this particle about the process which leads to the beginning of the formation of different stars and planets. But, we didn’t reveal how much it is old?
According to several scientists, however, it is globally accepted that the age of the solar system can be identified or determined by a simple process. This process can be done by studying the meteoroids. To recall, meteoroids are basically the left over from the so-called explosion that began the starting of our solar planets.
As per this process, scientists and astronomers, whatever you want to say judge or estimate the age of it by estimating the age of meteoroids. And they have come to the conclusion after several tests and researches that our solar system is approximately 4600 million years old (at the time of writing).
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