Daily Archives: February 5, 2015

Wow! Hubble Telescope Sees Rare 3-Moon Shadow Dance on Jupiter

Posted: February 5, 2015 at 3:50 pm

NASA's Hubble Space Telescope has captured three of Jupiter's moons marching across the huge planet's disc, a stunning sight that happens only once or twice every 10 years.

The rare triple-moon conjunction on Jupiter, which Hubble witnessed on Jan. 24, involved Io, Callisto and Europa three of the gas giant's four Galilean moons (so named because they were discovered by astronomer Galileo Galilei in the early 17th century).

"The moons in these photos have distinctive colors. The ancient, cratered surface of Callisto is brownish; the smooth icy surface of Europa is yellow-white; and the volcanic, sulfur-dioxide surface of Io is orange," representatives of the Space Telescope Science Institute (STScI) in Baltimore, which operates Hubble, wrote in a statement today (Feb. 5).

"The apparent 'fuzziness' of some of the shadows depends on the moons' distances from Jupiter," they added. "The farther away a moon is from the planet, the softer the shadow, because the shadow is more spread out across the disk."

The conjunction lasted about 42 minutes. The fourth Galilean moon, Ganymede, was outside Hubble's field of view during the triple transit, STScI representatives said.

Volcanic Io is the innermost of the Galilean moons, completing one lap around Jupiter every 1.8 days. Europa, Ganymede and Callisto have orbital periods of 3.6, 7.2 and 16.7 days, respectively.

With a diameter of 3,270 miles (5,260 kilometers), Ganymede is the largest natural satellite in the solar system. Indeed, it's bigger than the planet Mercury.

Europa is the smallest Galilean moon, at 1,900 miles (3,100 km) wide, but it generates excitement and intrigue disproportionate to its size. The satellite harbors an ocean of liquid water beneath its icy shell, and this ocean is thought to be in contact with Europa's rocky mantle, making possible all kinds of interesting chemical reactions.

Indeed, many scientists regard Europa as the solar system's best bet to host alien life. NASA is mapping out a robotic mission to Europa, which agency officials say should be ready to launch by the mid-2020s.

Follow Mike Wall on Twitter@michaeldwallandGoogle+.Follow us @Spacedotcom, Facebookor Google+. Originally published onSpace.com.

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Ukraine war escalation russian air force first contact with nato jets / , – Video

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Ukraine war escalation russian air force first contact with nato jets / ,

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Synopsis | Nato’s Further Enlargement By Thomas S. Szayna – Video

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Synopsis | Nato #39;s Further Enlargement By Thomas S. Szayna
THE SYNOPSIS OF YOUR FAVORITE BOOK =--- Where to buy this book? ISBN: 9780833029614 Book Synopsis of NATO #39;s Further Enlargement by Thomas S. Szayna If you want to add where...

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SCUGNIZZI FREE GROUP e Bikers Nato – Video

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SCUGNIZZI FREE GROUP e Bikers Nato

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Vladimir Putin: "L’Esercito Ucraino una legione della NATO" – 26/01/2015 – Video

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Vladimir Putin: "L #39;Esercito Ucraino una legione della NATO" - 26/01/2015

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NATO Defence Meeting: Alliance to decide about boosting efforts to counter Russia military threat – Video

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NATO Defence Meeting: Alliance to decide about boosting efforts to counter Russia military threat
A multinational quick-response task force is expected to be given the go ahead at the talks one which specialises in reacting within a few days to potential threats on the fringes of NATO #39;s......

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LIVE: Meeting of NATO Defence Ministers – Video

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LIVE: Meeting of NATO Defence Ministers
A meeting of North Atlantic Council (NAC) defence ministers is due to be held at NATO Headquarters in Brussels on Thursday, February 5. The meetings will be chaired by NATO Secretary General...

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NATO Secretary General – Doorstep Statement, Defence Ministers Meeting, 05 FEB 2015 – Video

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NATO Secretary General - Doorstep Statement, Defence Ministers Meeting, 05 FEB 2015
Doorstep statement by NATO Secretary General Jens Stoltenberg prior to the meetings of NATO Defence Ministers, 05 February 2015. More on our website: http://goo.gl/5GS1Js.

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LIVE: Meeting of NATO Defence Ministers (Press conference) – Video

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LIVE: Meeting of NATO Defence Ministers (Press conference)
A meeting of North Atlantic Council (NAC) defence ministers is due to be held at NATO Headquarters in Brussels on Thursday, February 5. The meetings will be chaired by NATO Secretary General...

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NATO Commander: 'Conditions In Eastern Ukraine Have To Change'

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Supreme Allied Commander Gen. Philip Breedlove attends a media conference at NATO headquarters in Brussels on Jan. 22. Breedlove told NPR on Thursday that "the conditions in eastern Ukraine have to change." Geert Vanden Wijngaert/AP hide caption

Supreme Allied Commander Gen. Philip Breedlove attends a media conference at NATO headquarters in Brussels on Jan. 22. Breedlove told NPR on Thursday that "the conditions in eastern Ukraine have to change."

NATO Commander Gen. Philip Breelove said that "hundreds and hundreds" of Russian troops are currently operating alongside separatists in eastern Ukraine, providing supplies, weapons and air defense in the battle against the Ukrainian government.

Russia has repeatedly denied that its forces are in Ukraine.

But in an interview with NPR Morning Edition host Renee Montagne, the general said that the Russian activity was beyond dispute.

"We all agree that there are Russian troops in eastern Ukraine," he said.

The U.S. has been providing non-lethal aid to Ukraine and the Obama administration has been weighing whether to send weapons.

In a related development Thursday, Secretary of State John Kerry was in Kiev, Ukraine's capital, discussing the fighting that has intensified recently.

"Clearly, what we see is that conditions in eastern Ukraine have to change," Breedlove said.

The United Nations says more than 5,300 combatants and civilians have been killed since pro-Russian separatists and Ukrainian forces began fighting last spring.

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