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Science begins for Smile

On 23 September, the European-Chinese Smile mission was declared ready to start revealing how Earth responds to the wind of charged particles from the Sun. This follows a busy in-space commissioning period since the spacecraft launched on 19 May and reached its target orbit for science operations on 20 June.

Scientists explain how a 300 TeV photon could reach Earth

A mysterious signal from a powerful gamma-ray burst may reveal how exotic particles and altered physics could let extreme radiation cross the universe The post Scientists explain how a 300 TeV photon could reach Earth appeared first on Physics World .

  • 300 TeV photon observed by LHAASO on 9 October 2022
  • Two speculative mechanisms: axion-like particles and Lorentz invariance violation
  • Observations require multiple distant sources to confirm

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