Todays Class.

 Aim:  We will begin to understand the way the earth and other planets formed, by discussing nebular and other theories


Standard 4-   Science Concepts

What we learned last year-----
Big bang theory- the universe started with a huge explosion.  Lots of dust-  A star exploded.

Nebular Hypothesis-  We might conclude that the Nebular Hypothesis is a part of the big bang theory-  It states that the earth and other planets were formed by a fast moving cloud of rotating dust.  We call the cloud a SOLAR NEBULA.

Nebula- Helium & Hydrogen -about 5 billion years ago began to contract and it had the shape of a flat disk with a (proto)sun in the center

Planets close to the proto sun were formed from metallic and rocky clumps of the dust..... those farther away were formed from fragments (small pieces of dust) and even ices.

Todays orbit resembles what is left over from the rotating cloud in the Nebula