Which two quantities need to be measured in order to determine the density of an extrasolar planet?
A) mass and composition
B) orbital period and mass
C) radius and orbital period
D) radius and composition
E) mass and radius
E) mass and radius
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If the proto star that became our Sun had been hotter and more luminous when it formed, what changes (if any) might have been experienced by our Solar System?
A) The Moon would not exist. B) Jupiter would now be farther from the Sun. C) No comets could have formed. D) Mars would be a gas giant. E) Terrestrial planes could only have formed closer to the Sun.
Electrons in atoms
a. orbit the nucleus in well defined circular orbits b. radiate electromagnetic energy continuously c. act as if spread out in a "cloud" around the nucleus d. behave as predicted by quantum mechanics
Notice that the parallax is greater (the apparent movement is larger) for the person than for the trees, and that the mountains do not appear to shift at all. Why?
A. The amount of parallax depends on an object's size, with greater parallax for larger objects. B. The amount of parallax depends on an object's size, with greater parallax for smaller objects. C. The amount of parallax depends on an object's distance, with greater parallax for more distant objects. D. The amount of parallax depends on an object's distance, with greater parallax for nearer objects.
Today, Mars has virtually no magnetic field
Indicate whether the statement is true or false