Transcript Star Evolution

Star Evolution
Order them youngest to oldest
A
B
C
D
E
F
Order them youngest to oldest
A
B
E
C
D
G
F
H
Answer: D, F, H, C, A, G, E, & B
A
B
D
C
E
G
F
H
Life cycle of a star
• Stars age as they run out of hydrogen fuel.
• Large stars go through 5 main stages.
Stage 1
• All stars are “born” or begin in a large
cloud of gas and dust called a nebula.
Stage 2
• A star will spend most of its life at this
stage, main sequence. Hydrogen (H)
undergoes nuclear fusion in the core.
Stage 3
• When the H starts to run out, the star will
expand and cool down forming a red giant.
Red Super Giant Star in Orion
Constellation
Stage 4
• Eventually, expanding will stop and the red
supergiant will collapse violently, causing a
bright supernova to appear.
Stage 5 (large star)
• As the core collapses, the gravity in the
center is so strong, nothing can escape.
• Even light is trapped, producing a black
hole.
Stage 5 (small star)
• Small stars (like our sun) will collapse into
a small, Earth sized star giving off dim light
as a white dwarf.
http://www.youtube.com/watch?v=iauIP8swfBY&feature=related
Order them youngest to oldest
A
B
C
D
E
F
Answer: A, F, D, C, then E or B
A
B
C
D
E
F
Which stages are missing?
Why?
Star Evolution