What is the characteristic color of an emission nebula?

A. blue
B. yellow
C. green
D. red
E. black


Answer: D

Physics & Space Science

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How did the Copernican model explain the apparent retrograde motion of the planets?

What will be an ideal response?

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Which of the following is ranked 7 on the Mohs scale?

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Which of the following materials is most likely to act as a reducing agent?

A) Na B) Na+ C) Cl2 D) Cl- E) both A and B

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When you plot the position of sun-like stars, you will find that ___

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Physics & Space Science