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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
  • Triangle Shirtwaist fire kills 146 in New York City
    In one of the darkest moments of America’s industrial history, the Triangle Shirtwaist Company factory in New York City burns, killing 146 workers, on March 25, 1911. The tragedy led to the development of a series of laws and regulations that better protected the safety of factory workers. The ...Continue reading
  • The settlement of Maryland
    The first colonists to Maryland arrive at St. Clement’s Island on Maryland’s western shore and found the settlement of St. Mary’s. In 1632, King Charles I of England granted a charter to George Calvert, the first Lord Baltimore, yielding him proprietary rights to a region east of the Potomac River ...Continue reading
  • King Faisal of Saudi Arabia assassinated
    In Riyadh, Saudi Arabia, King Faisal is shot to death by his nephew, Prince Faisal. King Faisal, son of King Ibn Saud, fought in the military campaigns in the 1920s and ’30s that helped forge modern Saudi Arabia. He later served as Saudi ambassador to the United Nations and in 1953 was made premier ...Continue reading
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