If you want to fly to Mars, you have to pick your departure date carefully. The ideal launch windows only come around every 26 months, and those launch windows are narrow because the planets need to be in alignment. Literally. ...
As Earth’s inhabitants suffer through what may wind up being the hottest year on record, there’s a Promethean spark of hope. Virtually unlimited fusion energy appears to be, if not right around the corner, at least within hailing distance. Last ...
