Transcript Stars part 3

THIS PRESENTAION HAS BEEN RATED
TG-13
TEACHERS’ GUIDANCE STRONGLY ADVISED
Some Material May Be Unintelligible For Students Under 13.
Intense Frames of Scientific Instruction, Analysis, Comparing
and Contrasting, Description, and for Some Vocabulary.
BY THE
CLASSIFICATION AND RATING ADMINISTRATION
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ASTRONOMY
Stars
OBJECTIVES
By the end of this presentation, students will
be able to
• explain evidence for the existence of stellar
evolution;
• explain the presuppositions of stellar evolution.
Evidence For Stellar Evolution
1. Assumed to happen.
Evidence is interpreted in that light.
Other assumptions include:
–• The energy output of a star is
produced from the fuel of nuclear
reactions and NOT by any other
means.
–• There is NO other alternate
explanation available.
Evidence For Stellar Evolution
2. Age of solar system is assumed to
be the same age as that of the earth.
Age of the earth is based upon the
age of the oldest rocks. Age of the
oldest rocks is based upon
supposition of the age of the earth.
Evidence For Stellar Evolution
3. Age of the universe is based upon the
theory of the Big Bang and stellar
evolution models. Stellar evolution
models are based upon the theory of
the big bang and the age of the
universe.
Evidence For Stellar Evolution
4. Age of the universe has been
measured based upon the rate of
expansion. This has an experimental
error of ±33%, yielding results of
14 billion years ± 43 %.
Evidence For Stellar Evolution
5. The Tully-Fisher method to measure
the age of the universe yielded ages
of 7 to 14 billion years. Most modern
methods yield values between 8 to
12 billion years.
Stellar astrophysicists have
calculated the age of the oldest stars
to be 16 to 19 billion years old.
ASTRONOMY
Stars