Lecture 9 Flashcards
(7 cards)
1
Q
comets
A
- formed beyond frost line
- big dirty snowball
- don’t always have tails
2
Q
comet parts
A
- coma is the atmosphere of the heated comet
- plasma tail: pushed by solar winds
- dust tail: pushed by photons from the sun
3
Q
Sun
A
- fusion makes the sun
- stable nuclear explosion
- Mass: 300,000 Earths
4
Q
Hydrostatic Equilibrium
A
- the explosion of a star is contained because gravity pulls it back in.
- the sun is in a constant battle
- fusion explosion at the core is contained by gravity
5
Q
The suns core
A
-fusion: protons are fused into helium = energy
6
Q
fission
A
big nucleus divides into smaller peices
-waste is radioactive
7
Q
fusion
A
small nucli fuse into a bigger one
-need high energy to overcome electromagnetic repulsion
