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Audio Stimulation of the Moment
Astronomy Picture of the Day
  • The Long Tails of Comet NEOWISE 
Image Credit & Copyright: Petr Horalek @petrhoralek 

Explanation: This Comet NEOWISE (C/2020 F3) now sweeps through our fair planet's northern skies. Its long tails stretch across this deep skyview from Suchy Vrch, Czech Republic. Recorded on the night of July 13/14, the composite of untracked foreground and tracked and filtered sky exposures teases out details in the comet's tail not visible to the unaided eye. Faint structures extend to the top of the frame, over 20 degrees from the comet's bright coma. Pushed out by the pressure of sunlight itself, the broad curve of the comet's yellowish dust tail is easy to see by eye. But the fainter, more bluish tail is separate from the reflective comet dust. The fainter tail is an ion tail, formed as ions from the cometary coma are dragged outward by magnetic fields in the solar wind and fluoresce in the sunlight. Outbound NEOWISE is climbing higher in northern evening skies, coming closest to Earth on July 23rd.
This Day in History
  • Occupy Wall Street begins
    On September 17, 2011, hundreds of activists gather around Zuccotti Park in lower Manhattan for the first day of the Occupy Wall Street Movement—a weeks-long sit-in in New York City’s Financial District protesting income inequality and corporate corruption. While the movement failed to see any of ...Continue reading
  • King Charles VI of France orders all Jews expelled from the kingdom
    King Charles VI of France orders the expulsion of all Jews from his kingdom. The culmination of a series of anti-Semitic orders from the monarchs of France, the order outlived the monarchy and remains one of the major contributing factors to the tiny percentage of the French population that ...Continue reading
  • Cheyenne and Sioux decimate frontiersmen at Beecher's Island
    Early in the morning on September 17, 1868, a large band of Cheyenne and Sioux stage a surprise attack on Major George A. Forsyth and a volunteer force of 50 frontiersmen in Colorado. Retreating to a small sandbar in the Arikaree River that thereafter became known as Beecher’s Island, Forsyth and ...Continue reading
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