MENLO PARK, California, Feb. 25 -- The SLAC National Accelerator Laboratory issued the following news release: * * * NSF-DOE Vera C. Rubin Observatory launches real-time discovery machine for monitoring the night sky * By Aaron Groff and Gaelle Suter Key takeaways:  * The NSF-DOE Vera C. Rubin Observatory has released its first alerts documenting astronomical events spotted by the observatory. * Among the first alerts are detections of supernovae, variable stars, active galactic nuclei,   more