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I think you mean "protoplanet hypothesis". In fact, astronomers usually call it the Nebular Hypothesis A protoplanet is a planet-like object that hasn't fully developed into a planet. Why that hypothesis? It's because it is the best we have to describe the origin of the solar system according to the Laws of Physics.
If you have studied hard in life science you should know this but the real answer is that yes the nebular hypothesis was made by helium and hydrogen..
The nebular theory applies only to our solar system; other solar systems need their own formation theories.
They emmit light because they have many stars.
In our solar system all the planets (and Sun) formed from one collapsing nebular. Therefore all the planets have the same stuff inside them. The differences between planets is caused by the differences in their outer layers as the planets formed at different distances form the Sun where the temperatures gradients allowed the condensation of different compounds. When you consider Xenoplanets, we do not know hat they are made of exactly yet.
I think you mean "protoplanet hypothesis". In fact, astronomers usually call it the Nebular Hypothesis A protoplanet is a planet-like object that hasn't fully developed into a planet. Why that hypothesis? It's because it is the best we have to describe the origin of the solar system according to the Laws of Physics.
nebular
The nebular model explains
a nebular creates stars as it caves in by its own gravity!
nebular
Nebular. has written: 'Felines' -- subject(s): Erotic comic books, strips
in a nebular
The answer is Nebular Theory
a guy
no
a cluster of stars.
It was first proposed in 1734 by Emanuel Swedenborg. Originally applied only to our own Solar System, this method of planetary system formation is now thought to be at work throughout the universe. The widely accepted modern variant of the nebular hypothesis is Solar Nebular Disk Model (SNDM) or simply Solar Nebular Model.