Back to Space Unit

Our Solar System
Pages (56-59)

How did our solar system evolve?
   · Cold cloud of dust & gas
   · Nebular theory – cloud of dust (matter) condensed to form Sun and planets

How or why did the sun form first?
   · About 5 billion years ago, a supernova occurred (tremendous explosion in which a star breaks apart, releasing energy and newly formed elements)
   · It formed a nebula (star)
   · That star began to collapse
   · Gravity pulled matter toward the center and the gas cloud became the sun
   · Nuclear Fusion gave off heat (and continues to)

How did the planets form?
   · Gas & dust spun around the sun
   · Gravity caused them to clump together
   · These “clumps” formed planets
   · The farther planets stayed as gas