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Of the terrestrial planets, mercury exhibits the greatest lateral variations (aka "temperature range") in surface temperatures
An extreme example of the greenhouse effect is thought to be associated with an abundance of carbon dioxide in the martian atmosphere
The atmosphere of Mars is less dense than Earths, but dust storms and sand dunes indicate wind action occurs on mars
The days of the week are named after the five planets visible to the unaided eye, the sun, and moon
Using the telescope, Galileo discovered that the planet Mars had polar ice caps not unlike those on Earth
The distance from Earth to the Sun is used to measure distances in the solar system and is called a light year
Although current technology will allow the construction of much larger optical telescopes, astronomers see no advantage in building these larger instruments
Radio telescopes have an advantage over optical telescopes in that they can be used during daylight hours
In the case of light, when a source is moving away, its light appears redder than it actually is
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