astronomers

al Spectra: Offers high-resolution spectra across a 2. broad range of stellar types and is available online for free. Sky & Telescope’s Spectroscopy Section: Provides practical guides and spectral 3. charts tailored for amateur use. Shelyak Instruments Spectral Atlas: Comes

er over 200 researchers across the globe, coordinating data collection from multiple observatories. The Breakthrough: On April 10, 2019, the team released the first image of a black hole’s shadow—a dark region surrounded by a bright ring—in galaxy M87. Implications: