Identify
questions and concepts that guide scientific investigations.
The Origin and Evolution of the
Universe
Evidence, models, and explanation
Evolution and equilibrium
FFS - Facts for Students
The sun, the earth,
and the rest of the solar system formed from a nebular cloud
of dust and gas 4.6 billion years ago. The early earth was very
different from the planet we live on today.
Stars produce energy
from nuclear reactions, primarily the fusion of hydrogen to
form helium. These and other processes in stars have led
to the formation of all the other elements.