Space.com TRAPPIST-1 Planets Tidally Locked to Star, Have Short Orbits | Video 22 February 2017 fborgosano Leave a comment Share: Most, if not all, of the 7 Earth-sized planets in the ultra cool dwarf star system may only face one way towards their sun, similar to Earth’s moon. Their orbits range from 1.94 days to about 20. from Space.com bit.ly/2l8WimY Share: