How do asteroids differ from comets?
A) Asteroids are rocky bodies and are denser than the comets, which are made of icy material.
B) Asteroids are rocky bodies and are less dense than the comets, which are made of icy material.
C) Asteroids are made of icy material and are denser than the comets, which are more rocky.
D) Asteroids are made of icy material and are less dense than the comets, which are rockier.
E) Asteroids and comets are both made of rocky and icy material, but asteroids are smaller in size than comets.
A
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As discussed in the video, the leading hypothesis for why Mars changed holds that interior cooling led to loss of its magnetosphere, allowing the solar wind to strip atmospheric gas away. How has the MAVEN mission provided evidence for this hypothesis?
a. It has measured rates of gas loss from the atmosphere today. b. It has measured the rate at which Mars’s interior has lost heat. c. It measured the amount of atmospheric gas that Mars had long ago. d. It has measured the strength of the magnetic field that Mars had long ago.
How long does light take to reach us from Proxima Centuri?
a. 4.2 ly b. 4.2 years c. 8.4 AU d. 8.4 km
If an applied stress is equal in three perpendicular directions, the stress is _____________.
Fill in the blank(s) with the appropriate word(s).
DNA molecules contain patterns for the production of
a. proteins. b. amino acids. c. phosphates and sugars. d. four kinds of bases. e. all of the above