As NASA’s Deep Impact (EPOXI) probe approaches Comet Hartley 2 for a close encounter on Nov. 4th, mission scientists are certain of only one thing:

“We’re about to be surprised,” says principal investigator Mike A’Hearn of the University of Maryland. “This comet is unlike any we’ve visited before, and we don’t know what we’re going to find.”


Newly-discovered jets spin

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For backyard stargazers, the next few nights are the best time to see green Comet 103P/Hartley 2 as it approaches Earth for an 11-million-mile close encounter on Oct. 20th.

The dark hours before dawn are the best so set your alarm clock, go outside, and look straight up. Comet Hartley 2 is not far from the bright star Capella in …

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[Update: October 13: Asteroid 2010 TD54 flew within the orbit of the moon on Oct. 11 while astronomers watched to see if the encounter caused any quakes on the space rock. It was flying over Southeast Asia, near Singapore, at the time. Astronomers at the Massachusetts Institute of Technology in Boston used a remote link with a NASA Infrared

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A new comet is swinging through the inner solar system, and it is brightening rapidly as it approaches Earth for a 100 million mile close encounter in mid-June.

Comet McNaught (C/2009 R1) has a vivid green head and a long wispy tail that looks great through small telescopes.

By the end of the month it could be visible to the …

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By Tim Carr

If Nicholas of Cusa and Ulugh-Beg weren’t famous then this man certainly was, and still is. The “father of modern philosophy” and brilliant mathematician has an honoured place in European history but what you might not know is that he also tried to reconcile the church and the Copernicans as to which world-view was correct.

In 1612, …

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