SA-Space

SA-Space

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In late March astronaut Scott Kelly and cosmonaut Mikhail Kornienko will take off in a Soyuz rocket from the steppes of Kazakhstan, heading to...

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Astrobiologists and planetary scientists have a fairly good idea of which chemicals might indicate the presence of oxygen-breathing, water-based life—that is if it is...

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I was saddened to hear Leonard Nimoy died. It was even more sorrowful to find that years of smoking had caught up with him....

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The planet Mars has been associated with its namesake god of war for millennia, but its own past may have been more violent than...

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The broad-shouldered summit of Mauna Kea holds many meanings for many people: For astronomers, it’s a high-altitude playground of stars, among the best places...

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The stars, the planets and you and I could just as easily be made of antimatter as matter, but we are not. Something happened...

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Editor's note: The following is the introduction to the February 2015 issue of Scientific American Classics: Conquering Space. I was eight years old when Neil...

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Four stars near the bright band of the Milky Way have revealed a secret: the presence of a hidden dwarf galaxy. Six years ago astronomers...

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Scholars have seen the golden ratio in nautilus shells, the Parthenon, da Vinci paintings and now in stars. A new study of variable stars...