... Planetary Systems Now Forming in Orion . ... Credit Copyright: NASA , ESA , M. Robberto ( STScI / ESA ), the HST Orion Treasury Project Team , L. Ricci ( ESO ) Explanation: How do planets form? ... Some proplyds glow as close disks surrounding bright stars light up, while other proplyd s contain disks further from their host star, contain cooler dust , and hence appear as dark silhouettes against brighter gas. ... Publications with keywords: planet formation - Orion Nebula . ... Spitzer s Orion . ...