At the surface of Saturn's atmosphere the strength of the magnetic field is
A) about the same as Mercury's magnetic field at its surface.
B) about the same as Venus' magnetic field at its surface.
C) about the same as Earth's magnetic field at its surface.
D) about the same as Mars' magnetic field at its surface.
E) about the same as Jupiter's magnetic field at its atmospheric surface.
Question 2
Each Voyager spacecraft carries a postcard designed to be understandable to any aliens that might someday encounter it. On the postcard, scientists pinpointed the location of Earth by triangulating it between pulsars.
Why did the scientists choose pulsars rather than some other type of star? A) Pulsars are very bright and therefore easy to find.
B) Several pulsars are located within a dozen light-years of our solar system, making them useful for finding our solar system.
C) We're pretty sure that aliens will have only radio telescopes and not optical telescopes, so they'll have a better chance of seeing pulsars than ordinary stars.
D) Pulsars are easy to identify by their almost perfectly steady periods of pulsation.
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