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Showing posts with label Space. Show all posts
Showing posts with label Space. Show all posts

August 5, 2011

Ariane 5 : Flight V203

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The fourth Ariane 5 mission in 2011 will orbit two direct-to-home (DTH) television broadcast satellites : ASTRA 1N for the Luxembourg-based operator SES Astra, and BSAT-3c/JCSAT-110R for the American manufacturer Lockheed Martin Commercial Space Systems.

The launch window opportunity begins at 21:53 (UTC) on August 5, 2011.

Some key numbers :

- This will be the 59th Ariane 5 launch.
- The launcher will be carrying a total payload of 9095 kg.
- Injection orbit : Perigee altitude = 249.6 km, Apogee altitude = 35959 km at injection, Inclination = 2° deg.
- Thrust at launch : 13000 kN.


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April 11, 2011

Star disintegration : A massive interstellar explosion near a black hole

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Little stars, be careful with the massive black holes...


Blast detected 3.8 billion light-years away on the center of a galaxy cataloged GRB 110328A. Astronomers say that this unusual explosion mark the destruction of a massive star wandered too close to its galaxy's central black hole.

More @ NASA

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November 14, 2010

Quantum Quest: A Cassini Space Odyssey

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Quantum Quest: A Cassini Space Odyssey est un film d'animation de science fiction qui raconte la histoire de Dave, un photon qui refuse de grandir et qui veut quitter son environnement natale : le soleil. Autre le fait de raconter d'une manière toute à fait originale une aventure spatiale depuis un point de vue subatomique, ce film met en valeur les images récupérées lors de 7 missions spatiales de la NASA et de l'ESA : Cassini-Huygens, SOHO, Mars Odyssey, Mars Express, Venus Express et Mercury Messenger. Ce film a aussi la particularité d'être le premier dans son genre à avoir été lancé par la NASA (plus précisément le Jet Propulsion Laboratory) avec un réalisateur de film indépendant dans le but de créer un film d'animation de science fiction basé sur des missions, la science et la découverte. Si vous voyez ce film en VO vous ne serez pas déçu par la panoplie d'acteurs de renommé ayant participé à ce projet : Chris Pine (le capitaine Kirk dans le tout nouveau Star Trek) comme Dave, Samuel L. Jackson comme la Peur, Hayden Christensen (Anakin Skywalker dans les épisodes II et III de Star Wars) comme Jammer, James Earl Jones comme l'Amiral, William Shatner (le capitaine Kirk dans les anciens films de Star Trek) comme le Noyau, Brent Spiner (l'androïde Data dans la série Star Trek : The Next Generation) comme le Coach MacKey, Mark Hamill (Luke Skywalker dans la trilogie Star Wars) comme le Vide, ... Il y a même Neil Armstrong qui prête sa voix dans le rôle du Dr. Jack Morrow.

 

More @ QQtheMovie 

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March 10, 2010

Is Obama's space policy right?

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Buzz Aldrin, member of Apollo 11, the first U.S. manned walk on the Moon, supports the new space policy of President Obama. In the other hand, http://www.supportconstellation.com presents several facts and elements (see the FAQ) which justify the Project Constellation. As a result of bipartisan outcry against the proposed cancellation of Constellation, President Obama has called for a “space summit” to be held in Florida on April 15th, in hopes of building a consensus for space policy. Whatever space policy adopted, I hope we continue to look toward the stars, with ambition and courage... Mars is not so far away... but perhaps have to stop on the Moon passing is a necessary step.



Following article comes from The Wall Street Journal
(http://online.wsj.com):

February 25, 2010

Trading the Moon for Mars
Obama's NASA budget has our space priorities right.
By Buzz Aldrin 

In January, President Obama announced a new budget for NASA that would, newspaper headlines screamed, "Eliminate Funds for Manned Missions to the Moon." Instead, the budget proposes new missions in near-Earth orbit. It also directly challenges and empowers the private sector to push the envelope of human space travel, and implicitly puts America on track to perfect life support and other technologies that can be tested closer to home before embarking on more distant destinations in space.

Many said the president's decision was misguided, short-sighted and disappointing. Having the experience of walking on the moon's surface on the Apollo 11 mission, I think he made the right call.

If we follow the president's plan, our next destination in space, Mars, will be within our reach. Rich in potential resources—including water, an atmosphere, and oxygen in the soil—Mars invites human exploration and eventual habitation. But perfecting the technology necessary to succeed in our eventual journey is a wise first step. Empowering the private sector to carry crews and cargoes into orbit faster is a critical second step.

The new NASA budget makes sense for many important reasons. First, the president is signaling that this agency deserves the full support of this administration and Congress, even as priorities are sorted out and other budgets are cut. Second, getting long-range space flight right requires getting near-Earth orbit perfect. Third, forestalling the moon mission in favor of perfecting the technologies that will allow us to reach Mars within some defined period ahead is sound. We should not rush it and experience an avoidable tragedy.

Mars is the long-range objective for our space program. Just as deep sea exploration began with practice in our littoral waters, a successful Mars mission begins with near-Earth orbit testing. To get to the final stage, we must perfect all that we'll need for the journey. The president' budget and step-by-step approach helps do that, minimizing the risks and costs as we go.

The new direction that Mr. Obama has set in this budget is the kind of bold initiative we have needed for many years. Mankind must explore and America must lead—in all aspects of space exploration, not least manned space exploration. But we must be willing to embrace real vision and reach for Mars with the patience that leadership has always required.

As President John F. Kennedy said in his historic 1962 speech at Rice University, "We choose to go to the moon in this decade and do the other things not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills."

The same can now be said of missions for the permanent human settlement of Mars. Yes, there will be risks. But a great nation has always known the risks of exploration are far outweighed by the discoveries and better lives that exploration brings to our country. With this budget, the president is preparing us for a brighter American future in space. I believe he deserves our support.

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March 1, 2010

De l'eau sur Encelade ?

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Ce que vous voyez comme de la lumière c'est en fait des jets avec des particules de glace, de la vapeur d'eau et de composés organiques. Ces jets ont lieu dans de nombreuses fissures le long des fameuses "rayures de tigre" près du pôle sud d'Encelade, lune de Saturne. Plus de 30 jets individuels de tailles différentes peuvent être observées dans l'image et plus de 20 d'entre eux n'avaient pas été identifiés auparavant.
Cette mosaïque a été créée à partir de deux images à haute résolution qui ont été capturés par la caméra de la sonde spatiale Cassini qui avait survolé ces jets le 21 novembre 2009. La vue a été obtenue à une distance d'environ 14000 kilomètres d'Encelade et à un angle de phase de 145 degrés. L' échelle de l'image est de 81 mètres par pixel.
Les scientifiques du projet Cassini continuent d'étudier la question de savoir si les réservoirs d'eau liquide existent sous la surface de cette lune.

More info @ nasa.gov

Posted via web from Sotreta's Box

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February 25, 2010

2012 : Will not be the end !!

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That's the very scientifical truth explained by Don Yeomans, a senior research scientist at Jet Propulsion Laboratory (Yeomans heads a group charged by NASA to watch for objects whose orbits bring them close to Earth). I just relay the article published in november 2009 on the JPL blog's website.


There apparently is a great deal of interest in celestial bodies, and their locations and trajectories at the end of the calendar year 2012. Now, I for one love a good book or movie as much as the next guy. But the stuff flying around through cyberspace, TV and the movies is not based on science. There is even a fake NASA news release out there… So here is the scientific reality on the celestial happenings in the year 2012.

Nibiru, a purported large object headed toward Earth, simply put - does not exist. There is no credible evidence - telescopic or otherwise - for this object’s existence. There is also no evidence of any kind for its gravitational effects upon bodies in our solar system.

I do however like the name Nibiru. If I ever get a pet goldflish (and I just may do that sometime in early 2013), Nibiru will be at the top of my list.

The Mayan calendar does not end in December 2012. Just as the calendar you have on your kitchen wall does not cease to exist after December 31, the Mayan calendar does not cease to exist on December 21, 2012. This date is the end of the Mayan long-count period, but then – just as your calendar begins again on January 1 - another long-count period begins for the Mayan calendar.

There are no credible predictions for worrisome astronomical events in 2012. The activity of the sun is cyclical with a period of roughly 11 years and the time of the next solar maximum is predicted to occur about May 2013. However, the Earth routinely experiences these periods of increased solar activity – for eons - without worrisome effects. The Earth’s magnetic field, which deflects charged particles from the sun, does reverse polarity on time scales of about 400,000 years but there is no evidence that a reversal, which takes thousands of years to occur, will begin in 2012. Even if this several thousand year-long magnetic field reversal were to begin, that would not affect the Earth’s rotation nor would it affect the direction of the Earth’s rotation axis… only Superman can do that.

The only important gravitational tugs experienced by the Earth are due to the moon and sun. There are no planetary alignments in the next few decades, Earth will not cross the galactic plane in 2012, and even if these alignments were to occur, their effects on the Earth would be negligible. Each December the Earth and Sun align with the approximate center of the Milky Way Galaxy but that is an annual event of no consequence.

The predictions of doomsday or dramatic changes on December 21, 2012 are all false. Incorrect doomsday predictions have taken place several times in each of the past several centuries. Readers should bear in mind what Carl Sagan noted several years ago; “extraordinary claims require extraordinary evidence.”

For any claims of disaster or dramatic changes in 2012, the burden of proof is on the people making these claims. Where is the science? Where is the evidence? There is none, and all the passionate, persistent and profitable assertions, whether they are made in books, movies, documentaries or over the Internet, cannot change that simple fact. There is no credible evidence for any of the assertions made in support of unusual events taking place in December 2012.

For more information on the silliness surrounding December 2012, see:

Wikipedia: look under “Nibiru collision.”

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