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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
  • Metropolitan Museum of Art opens in New York City
    On April 13, 1870 the Metropolitan Museum of Art is officially incorporated in New York City. The brainchild of American expatriates in Paris and a number of wealthy New Yorkers, the Met would not put on an exhibition until 1872, but it quickly blossomed into one of the world’s premier repositories ...Continue reading
  • First nonstop flight from Europe to North America
    German pilot Hermann Köhl, Irish aviator James Fitzmaurice and Baron Ehrenfried Günther Freiherr von Hünefeld, the expedition’s financier, complete the first Europe to North America transatlantic flight, taking off from Ireland and landing safely on a small Canadian island. The prevailing winds in ...Continue reading
  • British and Gurkha troops massacre hundreds of unarmed demonstrators in Amritsar Massacre
    In Amritsar, India’s holy city of the Sikh religion, British and Gurkha troops massacre at least 379 unarmed demonstrators meeting at the Jallianwala Bagh, a city park. Most of those killed were Indian nationalists meeting to protest the British government’s forced conscription of Indian soldiers ...Continue reading
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