Spectral Classification of Stars and Brown Dwarves

The Space News Podcast.
SpaceTime Series 26 Episode 147
*Detection of one of the highest-energy cosmic ray ever
In 1991, the University of Utah Fly’s Eye experiment detected the highest-energy cosmic ray ever observed. Then on May 27, 2021, the Telescope Array experiment detected what is now the second-highest extreme-energy cosmic ray ever recorded and the source is still a mystery.
*Pinpointing the source of Io's volcanic activity
A new study suggests that most of the Jovian Moon Io’s tidal, heating is concentrated within its upper mantle.
*Ariane 6 successfully completes its hot-fire test
The European Space Agency's new Ariane 6 rocket has successfully completed a key engine firing test in preparation for next year’s maiden flight.
December Skywatch The December solstice, the ticking time bomb that is Eta Carinae and the rock comet Phaethon are among the highlights of the December night skies on SkyWatch

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