"This striking image is the stellar nursery in the Orion Nebula, where stars are born. The red filament is a stretch of ammonia molecules measuring 50 light-years long. The blue represents the gas of the Orion Nebula. This image is a composite of observation from the Robert C. Byrd Green Bank Telescope and NASA's Wide-field Infrared Survey Explore telescope. ""We still don't understand in detail how large clouds of gas in our Galaxy collapse to form new stars,"" said Rachel Friesen, one of the collaboration's co-Principal Investigators. ""But ammonia is an excellent tracer of dense, star-forming gas."""