Over the swell of piano chords, whistles and cheers reverberated through Cherry Street Pier Wednesday afternoon as masked and temperature-checked young dancers took the stage on Philadelphia’s Delaware River waterfront. A year ago, the moment a tech rehearsal before welcoming a live audience would have been unthinkable for the Bearded Ladies Cabaret. But with news of falling COVID-19 case .
6 APRIL 2021
A cosmic gamma ray detected zipping across the Milky Way has broken the record for the most energetic we ve found yet, clocking in at a whopping 957 trillion electronvolts (teraelectronvolts, or TeV).
This not only more than doubles the previous record, it brings us close to the range of petaelectronvolts (that s a quadrillion electronvolts) - finally confirming the existence of cosmic superaccelerators that can boost photons to these energies in the Milky Way.
Such a superaccelerator is called a PeVatron, and finding them could help us figure out what is producing the high-energy gamma rays streaking across the galaxy. This pioneering work opens a new window for the exploration of the extreme Universe, said physicist Jing Huang of the Chinese Academy of Sciences in China. The observational evidence marks an important milestone toward revealing cosmic ray origins, which have puzzled mankind for more than one century.
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The fourth wave of coronavirus is here in Pennsylvania. Here s what health experts have to say. (Shutterstock)
PENNSYLVANIA For the second straight week, coronavirus case numbers increased across Pennsylvania and other parts of the United States, marking the start of what health officials are warning could be a fourth wave of the ongoing pandemic. This is despite a rapidly increasing vaccination rate that is teasing glimmers of herd immunity on the horizon.
It s unclear how long this wave could last. The Children s Hospital of Philadelphia Policy Lab, which has an active model forecasting case levels in the Delaware Valley and other parts of the country, notes there is great uncertainty. They do believe the spike is unlikely to be brief, but it is also unlikely to be severe, at least in the context of previous surges in the pandemic.
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