Observational Astronomy Supernova Characteristics Jet Dynamics Collaborative Studies Theoretical Models Peer-Reviewed Journals Supernova Rates Biosignature Gases Astronomical Discoveries Data Analysis Galactic Phenomena Peer-Reviewed Studies Galactic Dynamics Modeling Observational Techniques NASA eXoplanet Research Program Black Hole Characteristics Observational Studies Northwestern University Planetary Research Simulation Studies Interstellar Comet Studies REACH Project