In what sense is our unique Earth just "ordinary" from a cosmic perspective?
What will be an ideal response?
We are not in the center of our solar system, which is not in the center of the Milky Way, which is just one of billions of known galaxies in the universe. Our planet is made of common minerals that are abundant throughout the known universe, and are probably part of almost any planet forming around any other star now.
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The Other Frame is moving in the +x direction with x-velocity ? = 0.25 with respect to the Home Frame. The two-observer space time diagram in figure R5.9 shows the diagram t and x axes of the Home Frame and the diagram t? axis of the Other Frame. Which of the choices in that figure would best correspond to the diagram x? axis if the Newtonian concept of time were true?
A ball is subjected to a pressure of 25.0 atmospheres. The un-squeezed diameter of the ball is 4.00 cm. The squeezed diameter of the ball is 3.99 cm. The bulk strain on the ball is
a. 
b. 
c. 
d. 
e. 
Why doesn't the Moon fall toward Earth like apples do?
A) the great distance of the Moon prevents falling B) moon's small mass prevents falling C) moon does fall but its great distance keeps it from getting closer D) moon does fall but due to its tangential motion it also falls around Earth
The energy source for active galactic nuclei is probably a(n) ________ around a supermassive black hole
Fill in the blank(s) with correct word