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No, a planet does not collapse because gravity isn't strong enough to provide enough pressure to crush a planet.
You might make a planet heavier and heavier as to increase its gravity but at some point the pressure in the planet's core will be high enough to support nuclear fusion and the planet will have changed into a star. At that point radiative pressure also begins to fight gravity.
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Is an atmosphere possible without a magnetosphere Could a planet-sized Faraday cage act as an artificial magnetosphere?
Yes. Mars has a thin atmosphere despite not having a magnetosphere. A planet-sized Faraday cage would probably be impossible as it would likely collapse under its own gravity.
How can you say that the earth is a planet?
A planet - is defined as an object that has its own gravity, and is in orbit around a sun.
How would you explain your weightlessness of objects in outer space?
Objects dont have weight, its the gravity of whatever planet its on and its own gravity. If you were in space there would be no gravity therefore no weight.
How do you make a 3D or 2D solar system?
To make a solar system, you need a cloud with a huge amount of gas and dust (our Sun alone has a mass of about 2 x 1030 kilograms), which has to collapse under its own gravity.
What difference of a star and a planet?
A star is a luminous ball of plasma held together by its own gravity and produce energy through thermonuclear fusion. A planet is a body orbiting a star massive enough to be rounded by its own gravity but not massive enough to conduct fusion.
Is an atmosphere possible without a magnetosphere Could a planet-sized Faraday cage act as an artificial magnetosphere?
Yes. Mars has a thin atmosphere despite not having a magnetosphere. A planet-sized Faraday cage would probably be impossible as it would likely collapse under its own gravity.
What needs to occur for a star to be born?
A clump of matter must collapse under the attraction of its own gravity. The collapse must heat the matter up to form a plasma which undergoes thermonuclear fusion - of hydrogen into helium.
Why isn't the world flat?
Gravity has a preference for large ball shaped objects. In fact, being spherical under the force of its own gravity is part of the current definition of 'planet'.
What is the diameter in miles that a planet has to be in order to be considered a planet?
To qualify as a planet, a body has to be approximately spherical (achieving hydrostatic equilibrium under its own gravity), it has to orbit the sun and it has to have cleared its orbit of all other objects - so that at that distance from the sun, there are no other sizable bodies. Theres no set size, but to achieve an approximately spherical shape under its own gravity, a planet would have to be at least around 500-600 miles in diameter.
What two factors cause a nebula to develop into a star?
The two main factors that cause a nebula to develop into a star are gravity and heat. Gravity pulls the gas and dust in the nebula together, causing it to collapse under its own gravity. As the collapse continues, the temperature and pressure in the core of the collapsing nebula increase, eventually reaching a point where nuclear fusion ignites, and a star is born.
Where does a star get enough energy to stop the collapse that would be caused by its own gravity?
radiation pressure
How can you say that the earth is a planet?
A planet - is defined as an object that has its own gravity, and is in orbit around a sun.
How stars create?
Clouds of gas will collapse, under certain circumstances, due to their own gravity. These will eventually become stars. This process is described in more detail in the Wikipedia article on "Protostars".
Why is a high mountain composed of lead impossible for the planet Earth?
A high mountain of pure lead would collapse under its own weight because lead is so dense and soft
Where do black holes get gravity?
black holes are stars which collapsed under their own gravity.
How would you explain your weightlessness of objects in outer space?
Objects dont have weight, its the gravity of whatever planet its on and its own gravity. If you were in space there would be no gravity therefore no weight.
How do you make a 3D or 2D solar system?
To make a solar system, you need a cloud with a huge amount of gas and dust (our Sun alone has a mass of about 2 x 1030 kilograms), which has to collapse under its own gravity.
