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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
  • Whitney Houston earns her first #1 hit with “Saving All My Love For You”
    Whitney Houston was the daughter of soul singer Cissy Houston and niece of pop star Dionne Warwick, and she parlayed her vocal gifts and the professional nurturing of her well-connected family into superstardom of a kind rarely matched before or since. A near-unknown prior to the release of her ...Continue reading
  • Erie Canal opens
    The Erie Canal opens, connecting the Great Lakes with the Atlantic Ocean via the Hudson River. Governor DeWitt Clinton of New York, the driving force behind the project, led the opening ceremonies and rode the canal boat Seneca Chief from Buffalo to New York City. Work began on the waterway in ...Continue reading
  • Infant receives baboon heart
    At Loma Linda University Medical Center in Loma Linda, California, Dr. Leonard L. Bailey performs the first baboon-to-human heart transplant, replacing a 14-day-old infant girl’s defective heart with the healthy, walnut-sized heart of a young baboon. The infant, known as “Baby Fae,” was born with ...Continue reading
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