Scientists have not yet proven that Mars can currently support life as we know it on Earth. Based on data from the NASA Exploration Rover, Mars may have been able to support life approximately 4 billion years ago. More » Science Astronomy Planets

As of 2015 there is no conclusive evidence that life on Mars exists or has ever existed, but scientists are hesitant to give a definitive answer without conclusive data. Most experts agree that it is theoretically possib... More » Science Astronomy Space Travel

According to NASA, 7 billion years ago, Mars may have been an excellent place for microbes to live, but currently it cannot support life because the air is too thin and is comprised mainly of carbon dioxide. After drilli... More » Science Astronomy Planets
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As of 2015, the planet Uranus cannot support life as it is known on Earth. However, it is not impossible for this ice giant to sustain other life forms that can withstand its harsh environmental conditions, which are vas... More » Science Astronomy Planets

The distance to Mars varies between the planet's closest approach to Earth at 35 million miles and the farthest distance at 140 million miles. In theory, it would take the fastest spacecraft ever built 39 days to reach M... More » Science Astronomy Planets

According to, the atmosphere on Mars is around 100 times thinner compared to that of the Earth's and is composed of about 95 percent carbon dioxide. However, the Martian atmosphere is still thick enough to sust... More » Science Astronomy Planets

Because Mars with its famous red coloration is readily visible from Earth, it is unknown who first discovered it; NASA lists the planet as "known by the ancients." There are records of its existence as far back as ancien... More » Science Astronomy Planets