Earth's largest and oldest organism, the Pando aspen tree in Fishlake National Forest in Utah, is being eaten alive by ...

A colony on Mars will fail as a back-up plan after a catastrophe on Earth. It is hard to see how it could repopulate Earth with a significant number of people. Returning to Earth from space is a ...

A lunar colony would be far preferable to one on Mars. Its foundation is within the ambit of modern technology, and it could be rapidly serviced from Earth. The moon has many valuable resources ...