Scientists have announced the discovery of two new Earth-like planets within our own galaxy so similar to our own that they've already shot up into the top 20 contenders for future human colonization. The planets orbit a neighboring star, Teegarden, just 12.5 light years away in the Aries constellation. Teegarden is an ultra-cool dwarf star 10 times lighter than our own sun, eight billion years old, and was discovered back in 2003. "The two planets resemble the inner planets of our Solar System,"explains Mathias Zechmeister, an astrophysicist at the University of Göttingen and lead author of a study about the discovery. "They are only slightly heavier than Earth and are located in the so-called habitable zone, where water can be present in liquid form." Teegarden b has a 60-percent chance of a temperate surface environment suitable for habitation thanks to temperatures ranging from 0 to 50 degrees Celsius, with a likely average temperature of a balmy 28 degrees. Given its mass and