mostly hydrogen and helium
Mostly of hydrogen ... over 95 %.
alfrid wegner
The Earth was formed about 4.57 billion years ago when a mass of particles and gases formed a rotating cloud that eventually concentrated into what we know call Earth.
Continental drift
The most widely accepted theory for how Earth's moon was formed is called the impact theory. It says that the moon formed from a collision between Earth and a Mars-sized object about four and a half billion years ago.
hydrogen and helium
hydrogen and helium
hydrogen and helium
hydrogen and helium
hydrogen and helium
Mostly of hydrogen ... over 95 %.
nebular hypothesis
The Nebular Hypothesis.
The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System (as well as other planetary systems). It suggests that the Solar System formed from nebulous material.
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.
No, nobody uses the term "solar galactic hypothesis". You may be referring to a "solar nebula", in which a cloud of gas and dust collapses under its internal gravity to form a star and perhaps some planets.
in a nebular