nebular theory predicts that other solar systems that formed in the same way should also have 8 planets.?
The nebula hypothesis is the main hypothesis among scientists, which states that the planets formed from a cloud of material associated with the young sun, which was slowly rotating. Later in the 1900s, Thomas Schroeder-Chamberlain and Forrest Ray Moulton observed that a wandering star was approaching the Sun. As a result, an expanding (cylindrical) portion of the material – cigar-shaped – separated from the solar surface. As the passing star moved away, this material separated from the solar surface continued to slowly orbit the Sun until it condensed into planets. They concluded that the sun is surrounded by a solar nebula that contains mostly hydrogen and helium in addition to what can be called dust. The friction and collision of particles led to the formation of a disk-shaped cloud, while the planets were formed by the accretion process. It is the most widely accepted model of the origins of the universe to explain the formation and evolution of the solar system (as well as other planetary systems). It suggests that the solar system is made up of nebular matter. This theory was developed by Immanuel Kant and published in his Universal Natural History and Theory of the Heavens, published in 1755, and modified by Pierre Laplace in 1796. The mechanism of planetary system formation that was originally applied to the Solar System can be applied throughout the universe.
nebular theory predicts that other solar systems that formed in the same way should also have 8 planets.?
They arise from thermonuclear fusion reactions that occur in the sun.
It represents all electromagnetic radiation (visible light, infrared, ultraviolet, X-rays and radio waves).
why did the solar nebula heat up as it collapsed?
As the cloud shrank, its gravitational potential energy was converted to kinetic energy and then into thermal shock.
What does the nebular theory predict?
The nebular theory predicted the existence of the Kuiper belt 40 years before it was discovered! There were many more leftover planetesimals than we see today. Most of them collided with the newly-formed planets & moons during the first few 108 years of the Solar System. We call this the heavy bombardment period.