We present observations of SN 2020fqv, a Virgo-cluster Type II core-collapse supernova (CCSN) with high temporal resolution light curve from the Transiting Exoplanet Survey Satellite (TESS) covering time explosion; ultraviolet (UV) spectroscopy Hubble Space Telescope (HST) starting 3.3 days post-explosion; ground-based spectroscopic 1.1~days along extensive photometric observations. Massive sta...

It is well-known that the design and production of nuclear weapons required major efforts in scientific research and engineering, with a supporting infrastructure of weapons laboratories. Less well-known, is that scientific research and development have also played an important role in nuclear arms control. In this paper, my purpose is to explain the role of seismology in treaty verification; t...