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Turrican3

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Alla conquista di Marte - il thread sull'astronomia

Aperto da Kiwi, 20 Luglio, 2009, 17:49:31

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Kiwi


Quelo


Turrican3

Citazione di: Rot! il 24 Febbraio, 2010, 20:33:14Bellissima immagine, Turry

Eh, ma il tuo link la batte 10 a 0. :)

*NON* credo a UFO, alieni, area 51 e compagnia bella, ma questo fottuto universo è davvero TROPPO grande, non può non essersi venuta a creare da qualche altra parte la medesima fortunata coincidenza che ha fatto nascere la vita sulla Terra.

Hai proprio ragione: tutto ciò è affascinante.

:beer:

Sensei

Citazione di: Turrican3 il 24 Febbraio, 2010, 23:57:53
Eh, ma il tuo link la batte 10 a 0. :)

*NON* credo a UFO, alieni, area 51 e compagnia bella, ma questo fottuto universo è davvero TROPPO grande, non può non essersi venuta a creare da qualche altra parte la medesima fortunata coincidenza che ha fatto nascere la vita sulla Terra.

guarda che il mio lavoro non è una coincidenza....

Turrican3

Non sono sicuro di aver capito :sweat:, comunque intendevo riferirmi a tutta una serie di parametri (che so, massa del pianeta, distanza dal sole, ecc.) la cui combinazione ha creato condizioni compatibili con la sviluppo di forme di vita. :)

No? :look:

Kiwi


Blasor


Giulo75

Citazione di: Rot! il 24 Febbraio, 2010, 20:33:14
Bellissima immagine, Turry,

Saluti

PS: Vi slinko questo
Affascinante no?
Spettacolo. :o
Fa capire quanto l'umanita' sia ancora giovane e solo ancora ai primi piccoli gradini della sua evoluzione rispetto all'universo e tutto cio' che ci circonda.

Giulo75


Giulo75

Domandina da nabbo totale. Ma i "quanti" sono visibili a qualche microscopio galattico o sono solo teorizzabili?
Come hanno fatto a scoprirli? :mmmm:

Turrican3

#40
CitazioneNASA Telescope Reveals Largest Batch of Earth-Size, Habitable-Zone Planets Around Single Star

NASA's Spitzer Space Telescope has revealed the first known system of seven Earth-size planets around a single star. Three of these planets are firmly located in the habitable zone, the area around the parent star where a rocky planet is most likely to have liquid water.

The discovery sets a new record for greatest number of habitable-zone planets found around a single star outside our solar system. All of these seven planets could have liquid water – key to life as we know it – under the right atmospheric conditions, but the chances are highest with the three in the habitable zone.

"This discovery could be a significant piece in the puzzle of finding habitable environments, places that are conducive to life," said Thomas Zurbuchen, associate administrator of the agency's Science Mission Directorate in Washington. "Answering the question 'are we alone' is a top science priority and finding so many planets like these for the first time in the habitable zone is a remarkable step forward toward that goal."

At about 40 light-years (235 trillion miles) from Earth, the system of planets is relatively close to us, in the constellation Aquarius. Because they are located outside of our solar system, these planets are scientifically known as exoplanets.

This exoplanet system is called TRAPPIST-1, named for The Transiting Planets and Planetesimals Small Telescope (TRAPPIST) in Chile. In May 2016, researchers using TRAPPIST announced they had discovered three planets in the system. Assisted by several ground-based telescopes, including the European Southern Observatory's Very Large Telescope, Spitzer confirmed the existence of two of these planets and discovered five additional ones, increasing the number of known planets in the system to seven.

The new results were published Wednesday in the journal Nature, and announced at a news briefing at NASA Headquarters in Washington.

Using Spitzer data, the team precisely measured the sizes of the seven planets and developed first estimates of the masses of six of them, allowing their density to be estimated.

Based on their densities, all of the TRAPPIST-1 planets are likely to be rocky. Further observations will not only help determine whether they are rich in water, but also possibly reveal whether any could have liquid water on their surfaces. The mass of the seventh and farthest exoplanet has not yet been estimated – scientists believe it could be an icy, "snowball-like" world, but further observations are needed.

"The seven wonders of TRAPPIST-1 are the first Earth-size planets that have been found orbiting this kind of star," said Michael Gillon, lead author of the paper and the principal investigator of the TRAPPIST exoplanet survey at the University of Liege, Belgium. "It is also the best target yet for studying the atmospheres of potentially habitable, Earth-size worlds."

In contrast to our sun, the TRAPPIST-1 star – classified as an ultra-cool dwarf – is so cool that liquid water could survive on planets orbiting very close to it, closer than is possible on planets in our solar system. All seven of the TRAPPIST-1 planetary orbits are closer to their host star than Mercury is to our sun. The planets also are very close to each other. If a person was standing on one of the planet's surface, they could gaze up and potentially see geological features or clouds of neighboring worlds, which would sometimes appear larger than the moon in Earth's sky.

The planets may also be tidally locked to their star, which means the same side of the planet is always facing the star, therefore each side is either perpetual day or night. This could mean they have weather patterns totally unlike those on Earth, such as strong winds blowing from the day side to the night side, and extreme temperature changes.

Spitzer, an infrared telescope that trails Earth as it orbits the sun, was well-suited for studying TRAPPIST-1 because the star glows brightest in infrared light, whose wavelengths are longer than the eye can see. In the fall of 2016, Spitzer observed TRAPPIST-1 nearly continuously for 500 hours. Spitzer is uniquely positioned in its orbit to observe enough crossing – transits – of the planets in front of the host star to reveal the complex architecture of the system. Engineers optimized Spitzer's ability to observe transiting planets during Spitzer's "warm mission," which began after the spacecraft's coolant ran out as planned after the first five years of operations.

"This is the most exciting result I have seen in the 14 years of Spitzer operations," said Sean Carey, manager of NASA's Spitzer Science Center at Caltech/IPAC in Pasadena, California. "Spitzer will follow up in the fall to further refine our understanding of these planets so that the James Webb Space Telescope can follow up. More observations of the system are sure to reveal more secrets."

Following up on the Spitzer discovery, NASA's Hubble Space Telescope has initiated the screening of four of the planets, including the three inside the habitable zone. These observations aim at assessing the presence of puffy, hydrogen-dominated atmospheres, typical for gaseous worlds like Neptune, around these planets.



https://www.nasa.gov/press-release/nasa-telescope-reveals-largest-batch-of-earth-size-habitable-zone-planets-around

La NASA ha annunciato la scoperta di un sistema solare ad appena 40 anni luce da noi con sette pianeti di dimensioni simili alla Terra, di cui ben tre dotati di caratteristiche compatibili con lo sviluppo di forme di vita.

Parsifal

#41
Questo genere di scoperte (e in astronomia avvengono così all'improvviso e che nemmeno ti aspetti) mi emoziona sempre, seppur ai fini pratici umani rimangono spesso solo scoperta, adesso ed in futuro..
Il cosmo in generale mi affascina molto, oltre al puro contesto scientifico mi da quel senso di "pace"..

SilentBobZ

Se scoprissero forme di vita simil noi saranno casini religiosi.

Trappist 10 https://en.wikipedia.org/wiki/Trappist_beer#/media/File:Trappist_Beer_2015-08-15.jpg is better then Trappist 1

Turrican3

Citazione di: Parsifal il 23 Febbraio, 2017, 01:04:34Il cosmo in generale mi affascina molto, oltre al puro contesto scientifico mi da quel senso di "pace"..

Idem.
Paradossale come un ambiente pressochè costantemente così ostile per noi possa generare qualcosa del genere, eppure...

Detto questo, per mera questione statistica sono convinto che da qualche parte "là fuori" debba per forza esistere qualche altra forma di vita.

Sul cosa sia esattamente, e soprattutto se sia intelligente e possa rappresentare un pericolo invece la penso come Stephen Hawking, di cui credo molti conoscano questa famosa dichiarazione di qualche anno addietro "If aliens visit us, the outcome would be much as when Columbus landed in America, which didn't turn out well for the Native Americans". :sweat:

Bluforce

Ieri non ho potuto seguire l'annuncio in diretta, ma poi ho rimediato :gogogo:
Naturalmente tutto ciò è bellissimo e chissà nei prossimi anni cosa riusciremo a scoprire.