Exoplanet collision in binary star system, illustration. This catastrophic collision depicts what is thought to have occurred between two rocky exoplanets in the planetary system BD+20 307, turning both planets into dusty debris. The first evidence of warm dust in this system was reported in 2005. Further warm dust has been observed by the Stratospheric Observatory for Infrared Astronomy (SOFIA), supporting the theory that two rocky exoplanets collided. Such a collision could be similar to the type of event that created the Earth's Moon. BD+20 307 is around 300 light years from Earth, in the constellation of Aries. Image published in 2019.