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From ground observatories, based on its brightness, the original best estimate for the size of its nucleus was anywhere from 10-20 kilometres in diameter. New data from Hubble has significantly reduced that, putting an upper limit on the comet’s…

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Early risers are this week being treated to the sight of a “planet parade” in the eastern sky before sunrise featuring Saturn, Jupiter, Venus, Mercury and the moon. Best seen about an hour before sunrise on Sunday, Aug. 17, Saturn will…

Grab your telescope and aim it at Saturn in the early morning hours of Aug. 19 to see Titan’s colossal shadow sweep across the majestic gas giant’s cloud tops.

Tiny robots often struggle with batteries, sensors, and navigation, yet a common fruit fly already packs all three in a two and a half millimeter body. Researchers at Harvard’s Rowland Institute have now learned to steer those insects as if…

While most people witness only the familiar crack of thunder and flash of lightning from storms on Earth, brilliantly-colorful electric fireworks detonate much higher, in the thin air up to 55 miles overhead, easily seen from the ISS.

These brief…

Molecules capable of forming the precursors to sugars and amino acids have been detected, for the first time, in the disk of dust and gas whirling around a newborn star.

The detection is tentative, but it offers a window into how complex life…