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?
a. Talc b. Gypsum c. Diamond d. Quartz
Physics & Space Science
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
Physics & Space Science
When you plot the position of sun-like stars, you will find that ___
a. almost all sun-like stars are found in spiral arms b. sun-like stars are found in and out of spiral arms c. sun-like stars are left behind by the spiral arms that created them d. sun-like stars are only found in the outer 2/3 of the disk e. sun-like stars are only found in the inner 2/3 of the disk
Physics & Space Science