The solar system body that the planet Mercury most closely resembles is <1>. Mercury has no atmosphere, no real surface evolution, considerable cratering, and some ancient maria. Because Mercury is small, it cooled <2> after forming. The most original geologic features on Mercury are <3>, giant cliffs which are thought to be due to shrinkage of the planet during cooling. Due to Mercury's close proximity to the sun, the best time to observe Mercury is <4>. The proximity also leads to strong gravitiational effects as Mecury's period of rotation is in resonance with its period of revolution. During the time that Mercury makes 3 rotations, it makes <5> revolutions.
Venus is the brightest of the planets due to thick clouds and can reach an apparent magnitude of approximately <6>. The thick clouds also prevent direct observation of the surface. However, we have extensive altitude maps of the Venusian surface taken by the orbiting probe Magellan. It is also difficult to explore the surface of Venus due to the <7> temperature, <8> pressure, and the presence of sulfuric acid rain. The Russian Venera 10 spacecraft only lasted about 45 minutes on the surface of Venus.
The hottest planet in our solar system is <9>. This occurs because of the Greenhouse Effect -- the atmosphere is transparent to visbile light, but opaque to <10> light.
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Venus is the brightest of the planets due to thick clouds and can reach an apparent magnitude of approximately <6>. The thick clouds also prevent direct observation of the surface. However, we have extensive altitude maps of the Venusian surface taken by the orbiting probe Magellan. It is also difficult to explore the surface of Venus due to the <7> temperature, <8> pressure, and the presence of sulfuric acid rain. The Russian Venera 10 spacecraft only lasted about 45 minutes on the surface of Venus.
The hottest planet in our solar system is <9>. This occurs because of the Greenhouse Effect --the atmosphere is transparent to <10> light, but opaque to infrared light.
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