⚛️ Next up on our discovery countdown: Finding the universe’s first type of molecule, called helium hydride. Scientists spent decades searching for this type of molecule in the modern universe. We finally found it in a planetary nebula, confirming a key part of our basic understanding of the early universe. 🔭 See more amazing discoveries: https://go.nasa.gov/2XcLTej | SOFIA Stratospheric Observatory for Infrared Astronomy