ERS101H5 Lecture Notes - Lecture 2: Protoplanetary Disk, Formation And Evolution Of The Solar System, Outer Core
11 Jan 2020
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Document Summary
Big bertha (also known as lunar sample 14321) may be earth"s oldest rock (3. 8-4. 1 billion years old) and it was found on the moon. Solar nebula hypothesis: started as a rotating cloud of dust and gas (solar nebula). collapsed to form a flattened disk (protoplanetary disk) dust accreted to form rings around a central bulge" the protoplanetary disk of young star hd 163296. Gravitational attraction between particles resulted in accretion, forming planetesimals. The centre of the protoplanetary disk was dense and hot, formed a young star (the sun). How did the solar system form? (cont"d) planetesimals collided and accreted to form 8 planets (and 5 dwarf planetsand perhaps planet x deep in the solar system) (plummer et al. , 2007) Timing: earth, moon, mars, asteroids/ meteorites are nearly the same age composition: planets are composed of similar materials & have a similar structure. Meteorites! (nasa, 2019) most originate from asteroids (others from the moon and mars) .
