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Humans are yet to set foot on Mars, but over time, Mars has come to the humans.

Why is there water on Earth? Where do the hydrogen and oxygen that make up the earth's water come from? NASA Goddard/Flickr, CC BY Friday, February 12, 2021 7:58 AM UTC Water is essential to life as we know it and it seems completely normal to have water all around us. Yet Earth is the only known planet to be covered by oceans. Do we know exactly where its water came from? This is not a simple question: it was long thought that Earth formed dry – without water, because of its proximity to the Sun and the high temperatures when the solar system formed. In this model, water could have been ...

Water is essential to life as we know it and it seems completely normal to have water all around us. Yet Earth is the only known planet to be covered by oceans. Do we know exactly where its water came from? This is not a simple question: it was long thought that Earth formed dry – without water, because of its proximity to the Sun and the high temperatures when the solar system formed. In this model, water could have been brought to Earth by comets or asteroids colliding with the Earth. Such a complex origin for water would likely mean that our planet is unique in the universe.