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    • Why the US can't send humans to Mars

      Why the US can't send humans to Mars

      Business Insider via Yahoo News· 2 days ago

      Some of the US's earliest plans assumed humans could reach the Red Planet by the 1980s. Over the decades, technology and funding challenges ...

    • Sky’s next show: planetary parade

      The Columbian· 19 hours ago

      During such events, multiple planets can be seen across the sky. A “mini planetary alignment” is when three are aligned; a large alignment comprises five ...