What is the significance of this image?
A) It shows an actual disk of material orbiting another star, providing strong evidence the planets really do form in such disks.
B) It shows an artist's conception of what our solar system might have looked like when the planets were first forming.
C) It proves that jovian planets form farther from their stars than terrestrial planets.
D) The large gap visible in the image represents the frost line of a young planetary system, demonstrating that such a line really exists.
A) It shows an actual disk of material orbiting another star, providing strong evidence the planets really do form in such disks.
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What substances existed as solid flakes within the innermost regions (within about the inner 0.3 AU) of the solar system before planets began to form?
a. none b. only rocks and metals c. only hydrogen compounds d. only hydrogen and helium gases
Two identical buckets are filled to the brim, one with water and the other with alcohol. The liquid pressure at the bottom of the bucket of water is
1) less than the pressure at the bottom of the bucket of alcohol. 2) more than the pressure at the bottom of the bucket of alcohol. 3) equal to the pressure at the bottom of the bucket of alcohol. This is because 4) both containers are of the same volume. 5) alcohol is less dense than water. 6) both containers are filled to the same depth.
Climate models which ignore human activity
A) completely fail to match real climate data B) match real climate data quite well C) match real climate data perfectly D) match real climate data, but only poorly
Two charged particles, Q1 and Q2, are a distance r apart with Q2= 5Q1. Compare the forces they exert on one another when 
is the force Q2 exerts on Q1 and 
is the force Q1 exerts on Q2.
A.
.B.
.C.
.D.
.E.
.