What are stars, planets, gas, and dust all made of?
A.) Dark energy.
B.) Dark matter.
C.) Atoms.
Ans: C.) Atoms.
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Stars within an emission nebula, such as M42, are considered Population I stars
Indicate whether the statement is true or false
Consider two current-carrying circular loops. Both are made from one strand of wire and both carry the same current, but one has twice the radius of the other
If the magnetic field strength at the center of the smaller loop is B, what is the magnetic field strength at the center of the larger loop? A) 8B B) 4B C) 2B D) B/2 E) B/4
What is the visible surface of the Sun called?
a. Photosphere b. Atmosphere c. Stratosphere d. Glowing sphere
How does a particle’s relativistic kinetic energy K compare to its Newtonian kinetic energy when the particle’s speed 
?
A. 
B. 
C.