what is the nebular and big bang?

Question

help pls,,,,....thanks

Answer 1

Overachiever.. geez....

Nebula is/are the hotbed of gases that eventually turn into a star.

The big bang is the more generally accepted theory of how the universe was created. It is believed to be a literal explosion (bang) that launched all the materials for stars, planets and everything into existence.

Answer 2

In cosmogony, the solar nebula is believed to be a gaseous cloud from which Earth's solar system formed. This nebular hypothesis was first proposed in 1734 by Emanuel Swedenborg. In 1755 Immanuel Kant, who was familiar with Swedenborg's work, developed the theory further. He argued that nebulae slowly rotate, gradually collapsing and flattening due to gravity and eventually forming stars and planets. A similar model was proposed in 1796 by Pierre-Simon Laplace. These can be considered early theories of cosmology.

While originally applied only to our own Solar System, this method of planetary system formation was subsequently believed by theorists to be at work throughout the universe; over 200 extrasolar planets have since been discovered in our galaxy.

In physical cosmology, the term Big Bang has two related meanings. It is a cosmological model in which the universe has been expanding for around 13.7 billion years, starting from a tremendously dense and hot state. The term is also used in a narrower sense to describe the fundamental 'fireball' that erupted at or close to time t=0 in the history of the universe.

Observational evidence for the Big Bang includes the analysis of the spectrum of light from galaxies, which reveal a shift towards longer wavelengths proportional to each galaxy's distance in a relationship described by Hubble's law. Combined with the assumption that observers located anywhere in the universe would make similar observations (the Copernican principle), this suggests that space itself is expanding. Extrapolation of this expansion back in time yields a state in the distant past in which the universe was in a state of immense density and temperature. This hot, dense state is the key premise of the Big Bang.