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Astronomy
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Geometric Parallax
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Astronomy
AST.190 Geometric Parallax
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Why is direct geometric parallax not usually used as the only distance method for very far galaxies?
A
Parallax works only for objects inside Earth's atmosphere.
B
Galaxies do not emit any light.
C
The method requires stars to have exactly the Sun's mass.
D
Their apparent parallax angles are far too tiny to measure directly.
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