Planet Earth: Freshwater

Planet Earth - a brief history

Just 39 light years away lies the remarkable TRAPPIST-1 system, with 7 roughly Earth-sized planets and 3 in the habitable zone. These ancient worlds could harbor life. The most intriguing, TRAPPIST-1e, has estimated gravity and radiation levels very similar to Earth's. In this compact system, neighboring habitable planets are close enough for an advanced civilization to visit and explore, like quick trips between countries on Earth. If life exists here, TRAPPIST-1 could prove one of our best cha

Science 101: The Solar System

Solar System Overview, Planets & Moons

The Solar System