Mars is similar to Earth in the fact that both planets have about the same amount of dry land surface. Both planets also have volcanoes and impact basins. More »

Depending on the time of year and its position in the sky, Mars can be seen from Earth with the naked eye or in more detail with a small telescope. To the naked eye, Mars appears as a bright red star. With a telescope, o... More »

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Because Venus has an axial tilt of only 2.7 degrees, it lacks the seasons found on both Earth and Mars. Venus also has a very thick atmosphere and suffers from a runaway greenhouse effect, meaning that the surface of the... More »

The best time to view Mars is during the Mars Close Approach, which is when the orbits of Mars and Earth bring the planets closest together. When Mars and Earth make this close approach, Mars can be seen from sunset to s... More »

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Mars is a little over half the size of the Earth. Its diameter is 4,222 miles, which is 53 percent of Earth's diameter. The planet's mass is also small, at about 10 percent of Earth's total. More »

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A person weighing 50kg (110lbs) on Earth would weigh 19kg (42 lbs) on Mars. This is because the gravitational force on Mars is only 38 percent that of the gravitational force on Earth. More »

The best time to view Mars is during the Mars Close Approach, which is when the orbits of Mars and Earth bring the planets closest together. When Mars and Earth make this close approach, Mars can be seen from sunrise to ... More »

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