With all the exoplanet hunting going these days, astronomers have now logged more than 500 planets orbiting other stars in the Milky Way. Detecting planets in other galaxies, however, is still beyond the reach of scientific technology. But researchers have now discovered the next best thing – a planet of extragalactic origins orbiting a star within our galaxy that was deposited there billions of years ago when the Milky Way swallowed up a smaller dwarf galaxy.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.