Search results for giovanni cassini

Astronomy Nov 14, 2014

Clues revealed about hidden interior of Uranus

(Phys.org) —Long believed to be one of the blandest regions of any of the giant gas planets, the southern hemisphere of Uranus indicates a flurry of previously unknown atmospheric phenomena, hinting at an unusual feature ...

Astronomy Feb 26, 2013

Light-travel-time effect finds new astronomical applications

Sometimes the tried and true methods are still the best, even in observational astronomy. Researchers at the University of Prague demonstrated this recently in a study of the eclipsing binary system V994 Herculis (V994 Her).

Astronomy Sep 19, 2012

IAU votes to redefine the astronomical unit – giving it a constant value

(Phys.org)—Members of the International Astronomical Union have voted to approve a change to the definition of the famous "astronomical unit" aka, AU, from one based on variable data, to a definite number. The change has ...

Space Exploration Apr 30, 2012

The mystery of Venus’ ashen light

May is the best time to try and spot one of the most enduring unsolved mysteries in our Solar System. Ashen Light is a faint glow allegedly seen on the unlit portion of Venus, during its crescent phase, similar to the earthshine ...

Astronomy Jun 29, 2011

Clocking Neptune's spin

(PhysOrg.com) -- By tracking atmospheric features on Neptune, a UA planetary scientist has accurately determined the planet's rotation, a feat that had not been previously achieved for any of the gas planets in our solar ...

Space Exploration Jun 13, 2011

What’s up with Iapetus?

Although Saturn's moon Iapetus was first discovered in 1671 by Giovanni Cassini, its behavior was extremely odd. Cassini was able to regularly find the moon when it was to the west of Saturn, but when he waited for it to ...

Space Exploration Apr 25, 2011

Early European astronomers determined Easter dates

How do they know it’s Easter? Ever wondered how the exact dates of the Easter break are chosen? Easter Sunday can fall anytime between 22 March and 25 April and, thanks to European observations of the Sun that go back ...

Astronomy Jun 3, 2010

Hubble Images Suggest Rogue Asteroid Smacked Jupiter

(PhysOrg.com) -- Without warning, a mystery object struck Jupiter on July 19, 2009, leaving a dark bruise the size of the Pacific Ocean. The spot first caught the eye of an amateur astronomer in Australia, and soon, observatories ...

Space Exploration Dec 10, 2009

Cassini closes in on the centuries-old mystery of Saturn's moon Iapetus

Extensive analyses and modeling of Cassini imaging and heat-mapping data have confirmed and extended previous ideas that migrating ice, triggered by infalling reddish dust that darkens and warms the surface, may explain the ...

Astronomy Oct 7, 2009

Largest Ring Around Saturn Discovered

(PhysOrg.com) -- NASA's Spitzer Space Telescope has discovered an enormous ring around Saturn -- by far the largest of the giant planet's many rings.

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