Astronomy: space conquest and the latest news from the stars

General scientific debates. Presentations of new technologies (not directly related to renewable energies or biofuels or other themes developed in other sub-sectors) forums).
moinsdewatt
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Re: Astronomy: latest news stars, March 2016




by moinsdewatt » 29/05/17, 22:09

The death of a giant star causes the creation of a black hole without going through a supernova

May 29, 2017

American researchers have observed the transformation of a giant star into a black hole. But, contrary to the process that was thought to have been established, it did not explode into a supernova at the time of her death.
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Image
Between 2007 and 2015, the giant star has disappeared without causing an explosion of light.

NASA, ESA, and C. Kochanek (OSU)


http://mashable.france24.com/monde/2017 ... asa-hubble
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Re: Astronomy: latest news stars, March 2016




by moinsdewatt » 05/06/17, 12:13

From 50 times the mass of Jupiter, this monumental exoplanet eclipses its star

the 05.06.2017

The young star PDS 110 is experiencing regular drops in brightness probably caused by a giant exoplanet with rings.

A thousand light-years away from Earth, the young star PDS 110 shines in the constellation Orion. It has been observed for several years in particular by KELT telescopes and those of the WASP network, led by astronomers from the University of Warwick. While observing the images of the star, they noticed that the star knew every two and a half years a decrease of luminosity of approximately thirty per cent for two to three weeks. A phenomenon that was well documented in November 2008 and in January 2011. In a study to appear in the Monthly Notices of the Royal Astronomical Society, they explain this occultation by the presence of a giant exoplanet, more than fifty times the mass of Jupiter. This monumental planet would block a portion of the star's rays as it passes in front of it in the Earth's line of sight. And they even assume, in view of the rapid decrease in brightness during the two eclipses of 2008 and 2011, that this exoplanet is surrounded by a ring system like those of Saturn but much more extensive.

................

https://www.sciencesetavenir.fr/espace/ ... ile_113422
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by Christophe » 03/10/17, 13:50

We are not the 1er April: http://www.telerama.fr/monde/ondes-grav ... 138202.php

It's still a little sore on the head ... : Cheesy:

The Nobel Prize winner for gravitational waves: Einstein was right, we live well in soft calf

Albert Einstein theorized it, international teams of researchers confirmed it, a hundred years later: the gravitational waves, these vibrations of space-time, were detected. These scientists were awarded the Nobel Prize for Physics 2017 for this discovery.

Let's forget these stories of elastic fabric or lake surface representing space-time. These are two-dimensional mentions. In reality, we are born, live and die all in calf soft. We, ladybugs, two-euro coins and stars. All stuck in the same elastic jelly that we make tressauter, more or less strong, according to our respective masses. Let's be clear, we do not weigh heavy in the calf soft. Even our Sun is a featherweight. And when a ladybug, a man, a two-euro coin or a sun like ours dies, there's not much going on. But when a residual star of more than 3,3 solar masses collapses on itself for lack of fuel, it ends up in a black hole, which, let us agree, stir much more the soft of calf than the death of a being expensive. And if two black holes begin to dance the jitter in the jelly, then the vibratory waves they send around them, all over the universe, distort space-time considerably. The mou gigote.

"We should be able to capture these gravitational waves, but it will be cotton," said Albert Einstein, in a sustained language, a century or so ago, a year after he laid the theory of general relativity that forever changed the idea that we made space. Before Einstein, space, that is, the emptiness that remains when one removes all matter, was considered a rigid structure. With Einstein, the space becomes this jelly whose elastic structure can be deformed by the material.

Well, dear Albert, it's done! Once again your great theory is confirmed. The LIGO interferometer (Laser Interferometer Gravitational Wave Observatory) installed in the United States on two sites located 3000 kilometers apart, one in Louisiana, the other in the state of Washington, observed the 14 last September to 11h51 the dance of two black holes, of respectively 29 and 36 solar masses, located at 1,3 billion light-years, and which eventually merge. The two giants got into the bacon at two-thirds the speed of light. It was the first time we had seen such a stellar cataclysm. The monster resulting from the fusion "weighs" only 62 times the mass of the Sun. The three missing masses were transformed into energy (according to Einstein's law, always him, E = mc2). The energy of gravitational waves, according to the European and American teams of Virgo and LIGO who analyzed the data.

A deformation of fractions of a millionth of a billionth of a millimeter

The LIGO detector consists of two tunnels four kilometers long in which synchronized laser beams circulate. If nothing comes to disturb their progress, they stay in phase. If a gravitational wave deforms the Earth, one arm can stretch, the other shrinks and the two lasers are no longer synchronized. It is this tiny deformation that the researchers have captured. Because the gravitational waves sent by the dance of the two black holes have an extremely small amplitude. On a four-kilometer arm, deformation measures a fraction of a millionth of a billionth of a millimeter.

This major discovery is that of the Higgs boson in particle physics. It may also be worth to its authors the Nobel Prize for Physics in the fall. She establishes (once again) that Einstein was the greatest scientific genius of all time. It also paves the way for a new type of astronomy dedicated to these strange things unobservable in visible light, like the gravitational collapse of a massive star or the dance of black holes. Incidentally, she confirms that the man, the ladybird, the two-euro coin and the sun are born, live and die in calf soft.
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Re: Astronomy: latest news stars, March 2016




by izentrop » 03/10/17, 14:13

We're talking about it right now on https://www.franceinter.fr/emissions/la ... tobre-2017
Image

It's true that the space / time is distorted each time 2 super black holes meet and merge, but from there to give headache : Mrgreen:
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Re: Astronomy: latest news stars, March 2016




by Christophe » 03/10/17, 15:09

Speaking of black hole, I still prefer to have a headache than c * l ... : Mrgreen:

Ok ok ok ok ... I'm going out ... : Cheesy:
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Re: Astronomy: latest news stars, March 2016




by Christophe » 23/12/17, 17:37

Panic that night at the launch of a rocket Space X (a bit special or it was the weather that was ???): : Cheesy:





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Re: Astronomy: latest news stars, March 2016




by Christophe » 26/01/18, 13:40

http://www.pourlascience.fr/ewb_pages/a ... -39099.php

Convection on the surface of a red giant unveiled

Thanks to the Pionier instrument of the VLT, astronomers have for the first time observed the convection cells of a giant red star, thus validating the theoretical models.


gianterouge_1801.jpg
geanterouge_1801.jpg (64.19 KIO) Accessed 4268 times


In almost five billion years, the Sun will probably look like the star π1 Gruis. This "red giant", located at 530 light-years, has a mass of only 1,5 times that of the Sun but its diameter is 700 times larger. Located in the constellation Crane, it shines with a brightness several thousand times more intense than the Sun. Claudia Paladini, from the Free University of Brussels, and her colleagues used the Very Large Telescope (VLT) Pionier instrument to observe the surface of π1 Gruis. They have thus highlighted certain convection structures in agreement with the theoretical models.


(...)
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Re: Astronomy: latest news stars, March 2016




by Christophe » 26/01/18, 14:05

Funny:

A comet suddenly slows its rotation as it approaches the Earth

The 41P / Tuttle-Giacobini-Kresak comet passed close to the Earth last April and was finally observed by astronomers from every angle. They then discovered that its rotation period had suddenly slowed down, the nucleus turning on itself no longer in 24 h, but in 48 h in just six weeks.

(...)


http://sciencepost.fr/2017/10/comete-ra ... -de-terre/
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Re: Astronomy: latest news stars, March 2016




by Christophe » 07/02/18, 10:11

The scientific article of the day: SpaceX rocket is the most powerful in the world ... but exceeded by Saturn 5 there is almost 50 years anyway! Live the journalistic contradictions! : Cheesy:

All the same, this raises the question of the growing privatization of "the technological evolution of humanity" ... finally, with social networks, "evolution" has been privatized for a while!

http://www.levif.be/actualite/internati ... 95351.html

First historic flight of the most powerful rocket in the world (Video)
The Vif 06 / 02 / 18 to 23: 30 - Updated to 23: 32 Source: Afp

The world's most powerful rocket, SpaceX's Falcon Heavy made its first historic flight on Tuesday, launching a scuba manikin in the direction of Mars at the wheel of a cherry red sports car.
(...)
When the 27 Merlin engines of this super-rocket ignited, to generate a thrust of more than 2.500 tons, the equivalent of 18 Boeing 747 vertically, the assembly of the three Falcon 9 launchers did not, however, move directly to Mars.


The destination of this flight is the distant space, at a distance roughly equivalent to that of Mars in relation to the Sun, where the craft will be placed in orbit.

Colossal challenges

SpaceX had so far only carried out static tests. And Elon Musk hammered Monday that it would already be a success if the rocket "left the launch pad and did not pulverize it into a thousand pieces".

A prudence justified by the colossal stakes of the project. In technological terms, of course, but also in terms of economies of scale that such a success can mean.

SpaceX claims Falcon Heavy can launch twice the payload of the most powerful operating rocket in existence, the Delta IV Heavy, "at a third of the cost." According to the United Launch Alliance, which operates the Delta IVs, the cost of a launch is $ 350 million.

Added to this is a significant geostrategic dimension. If SpaceX wins, NASA can do without the help of the Russians and their Soyuz ship to send men into space.

At SpaceX, "with every failure they encountered, they immediately bounced back," Erik Seedhouse, a professor at the US Aerospace University Embry-Riddle, told AFP, insisting that the company "had more launches last year than any country."

With his power, only surpassed in history by the Saturn V rocketFrom NASA, which took astronauts from the Apollo missions to the moon, the Falcon Heavy will be able to put up to 63,8 tons in low Earth orbit, nearly three times the load that can carry a Falcon 9.



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Re: Astronomy: latest news stars, March 2016




by Gaston » 07/02/18, 10:41

Christophe wrote:The scientific article of the day: SpaceX rocket is the most powerful in the world ... but exceeded by Saturn 5 there is almost 50 years anyway! Live the journalistic contradictions! : Cheesy:
It is the most powerful "still in service".

As the whale shark is "the largest shark in the world" still in existence, but much smaller than the megalodon.
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