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Since 1960, dozens of spacecraft have been sent to Mars. It is difficult to send a spacecraft to Mars and even harder to land on the planet because of the thin atmosphere.
Data revealed the largest volcanoes in the solar system and one of the largest canyons yet discovered. Dust storms regularly sweep over the plains. Several spacecraft orbiting Mars shows an active planet rich in ingredients needed for life - water, organic carbon, and an energy source.
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Everything we've learned about Mars over the last century suggests that the planet was once able of hosting ecosystems.
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When scientists view the Martian surface, they see branching streams, river valleys, basins, and deltas, suggesting that the planet may have once had a vast ocean covering its northern hemisphere. It was likely wrapped in a thick atmosphere able to maintain liquid water.
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Once every 26 months, Earth and Mars are aligned to enable spacecraft to reach it in about half a year. Space agencies launch probes during these conjunctions.
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The red planet is actually many colors. At the surface, we see colors as brown, gold, and tan. The reason Mars looks reddish is due to oxidization—or rusting—of iron in the rocks, regolith (Martian “soil”), and dust of Mars. This dust gets kicked up into the atmosphere and from a distance makes t...
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