The sun keeps the planets in its orbit with a tremendous magnetic force. What would happen if it disappeared entirely? Learn about the estrella at the center of our solar system, and how it is critical to all life as we know it.
Seven Earth-sized planets have been observed por NASA's Spitzer el espacio Telescope around a tiny, nearby, ultra-cool dwarf estrella called TRAPPIST-1. Three of these planets are firmly in the habitable zone.