In the future, will our technologies help stabilise or planet and population, leading to a very long lifetime for us? Or will we destroy our world and its inhabitants, after only a brief appearance on the cosmic stage?
Jill TarterEarlier generations of stars in the galaxy could well have had planets. But really, there was only hydrogen and helium to work with, so they'd all be gas giants and not small, rocky planets.
Jill Tarter