"Harnessing local materials is the key to unlocking sustainable human presence on Mars." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Settling ...

The resoluteness of NASA's ambitious vision to send astronauts to Mars—a round-trip voyage of more than a billion miles once limited to science fiction—appears stronger than ever, albeit not without ...

Mercury retrograde gets a lot of hype for astrology aficionados. However, other planets also have retrograde motion and appear to move backward in the sky, too. Unlike Mercury, who backslides three to ...