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Which planet is closest to the sun?Mercury is the closest planet to the sun, followed by Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Mercury orbits ...
Images of Mars taken from orbit show thousands of mounds in a region sculpted by water billions of years ago. A robotic mission may investigate the area one day.
From mammoth African elephants to giant whales, let's take a look at the 8 largest mammals that inhabit our planet.
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