AST 111 Lecture Notes - Lecture 10: Radiometric Dating, Radiocarbon Dating, Space Debris

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Published on 20 Oct 2015
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AST 111: Lect 10-The formation of stars and galaxies
-The cosmic amounts of the elements are the result of how stars evolve
Mostly Hydrogen and Helium
Only 2 Other elements
The other elements came from births and deaths of previous stars!
-Stars are nuclear factories
Produce all other elements
-Radioactivity helps date the universe
-What happens in radioactive decay?
The elements are changing in to other elements!
When half of the matter is gone, it is called a half-life
oCarbon dating is most common because of its relatively short half-life
Using radioactive dating, they have said the universe is only 4.56 Billion years
old
-When new stars form, they have disks around them full of matter
This matter is what forms all of the planets and space debris in the solar system
The closer the planets form to the sun, the more likely they are to be terrestrial,
and the farther away they are the more likely they are to be icy/gaseous (Jovian)
oThe Jovian planets are much more massive because they were able to
quickly attract gasses during the formation of the solar system
-The process of bringing the dust and ice in the disks together is called ACCRETION
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