Computer scientist and futurist Ray Kurzweil believes humanity will achieve “longevity escape velocity” in just five years. The concept basically states that due to medical and technological ...

But to travel from low-Earth orbit (LEO) to farther orbits—or even the Moon—requires a different kind of ion thruster capable ...

After 10 minutes, the rotating arm would reach the moon’s escape velocity of 2.4 km per second—about one-sixth of Earth’s ...