Gliese 581c or Gl 581c is a planet orbiting within the Gliese 581 system. The Gliese 581 system is a near neighbor of Earth, located just 20 light-years away. I'll be creating a website dedicated to selling real estate there soon. also points out that when the red dwarf was a strong X-ray and EUV emitter, planet surface temperatures would range from 700 K to 1000 K (430 to 730 °C), like Venus today. it's not turning around its own axis, and thus it's always showing the same side to the star (like our moon is always showing the same side to our Earth). Le 9 octobre 2008 à 6 h 0, un signal radio, intitulé A Message from Earth (Un message de la Terre), est émis en direction de l’ étoile Gliese 581, à destination notamment de la planète Gliese 581 c. Le système Gliese 581 se trouvant à environ 20,5 années-lumière de … グリーゼ581cは、初めて発見された ハビタブルゾーン 内に存在する地球型の惑星とされたため、天文学者達から多くの関心を集めた 。. Según el equipo de Udry, la temperatura de equilibrio para Gliese 581c es de -3 °C si se asumen un albedo (porcentaje de luz reflejado por la atmósfera ), como Venus (0,64), y 40°C si se asume un albedo de 0,35 (similar al de la Tierra). Gliese 581 c Gliese 581 adlı bir "kırmızı cüce" sisteminde yer alan gezegendir. I adore Earth-like exoplanets! It was discovered in April 2007. It is the second planet discovered in the system and the third in order from the star. Cosmic Call One 6. But why these planets are not communicating each others is very weird question. Gliese 581 c, planet, semi-major axis: 0.0721±0.0003 AU 1.3. Gliese 581 4. Gliese 581 c or Gl 581 c is a "Super-Earth", a large extrasolar terrestrial planet, orbiting the red dwarf star Gliese 581. Gliese 581c is the third planet in order from its host star. Gliese 581d has a mass of around 7 to 8 times that … This video is unavailable. [4] The study by Selsis et al. Anyone got calculations for: (based on 20.5 light years...) ? The signal is a digital time capsule containing 501 messages that were selected through a competition on the social networking site Bebo. Gliese 581 g, planet, semi-major axis: 0.1460AU Space.com Q&A on Gliese 581g • link. Pop band McFly chose to send a message praising singer Cheryl Cole's "perfect body". Message boards : Gliese 581d orbits a red dwarf, the star has a mass of around one third of the sun. Stay tuned. Gliese 581 c is likely to have a runaway greenhouse effect. We have sent probes to get close-up views and investigate the Moon, Mars, and other planets in … Gliese 581c orbits a red dwarf, the star has a mass around one third of that of the sun. In 2008, a message broadcast towards Gliese 581c, an exoplanet thought capable of hosting life, consisted of photos, drawings and text messages gathered by a social media website. Any reply to the messages probably wouldn’t reach Earth for 40 years. Gliese 581d is the third planet from its host star in the Gliese 581 system, or the fifth planet if you include two unconfirmed planets. Done. A Message from Earth (AMFE) is a high-powered digital radio signal that was sent on October 9, 2008, toward Gliese 581c 2007 Astronomy and Astrophysics 476, 1365, Selsis et al. The planet is classed as a Super Earth, exoplanets which have up to 10 times the mass of our own planet. Gliese 581c is 20 light years from Earth. The message should reach the Gliese system by about 2029. Message boards: SETI@home Science: Gliese 581c too hot for life say some ©2020 University of California SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. Gliese 581c (GJ 581c) là một ngoại hành tinh Siêu Trái Đất.Đây là ngoại hành tinh quay quanh ngôi sao Gliese 581, là hành tinh thứ hai được phát hiện trong hệ thống và là hành tinh thứ ba được xếp loại 6 hành tinh trong hệ ngôi sao.Với khối lượng ít nhất gấp 5,5 lần Trái Đất.. Gliese 581c … A Message from Earth (AMFE) is a high-powered digital radio signal that was sent on October 9, 2008, toward Gliese 581c It is the third planet claimed in the system and (assuming a five-planet model) the fifth in order from the star. Gliese 581c Smart Glasses 10in1 Function Highlights: 1.Photo Taking function 2.Camera Camcorder function 3.Doze Reminder function 4.PC camera function5.U-disk function6.Bluetooth function7.Phone call function8.Listen music from your mobile phones9.Mobile Synchro GPS Voice Navigation on Bluetooth Mode for driving10.Eme SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. Gliese 581 c – planeta pozasłoneczna typu superziemia orbitująca wokół czerwonego karła Gliese 581.Uważa się, że planeta znajduje się w takiej odległości od gwiazdy, że temperatura powierzchni planety pozwala na istnienie wody w stanie ciekłym, a co za tym idzie istnieją na niej warunki dogodne do powstania życia tlenowego. We apply our model to calculate the habitability of the two super-Earths in the Gliese 581 system. The signal is a digital time capsule containing 501 messages that were selected through a competition on the social networking site Bebo . The signal will reach the planet Gliese 581c in early 2029. With a mass at least 5.5 times that of the Earth, it is classified as a super-Earth (a category of planets from 5 to 10 Earth masses). An exclusive video about two of the most promising life holding planets. Message boards: SETI@home Science: Earthlike planet discovered - Gliese 581c ©2020 University of California SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. Gliese 581c is a planet orbiting within the Gliese 581 system.It is classified as a super-Earth. Gliese 581 ( / ˈ ɡ l iː z ə /, also known as HO Librae) is a red dwarf star with spectral type M3V, located about 22 [9] light years away from Earth in the constellation Libra.Its estimated mass is about a third of that of the Sun, and it is the 89th [10] closest known star to the Sun. seriously - that's one of the coolest discoveries in years! A Message from Earth (AMFE) is a high-powered digital radio signal that was sent on 9 October 2008 towards Gliese 581c. We have sent probes to get close-up views and investigate the Moon, Mars, and other planets in our solar system. 1. 7064 submissions as of this edit/post. At the time of its discovery it was the smallest exoplanet detected around a main sequence star. ;) ). At the time of its discovery it was the smallest exoplanet detected around a main sequence star. Oli Madgett, from the media company RDF Digital who came up with the idea, said the message “passed the Moon in 1.7 seconds, Mars in just four … Gliese 581 c este a treia … (maybe according to galactical constitution no crime happening planets do not bother to contact crime struggler ones. Our best telescopes cannot resolve much more than a dot of any extra-solar planet. Physical messages like that of the Pioneer plaque may also be considered an active SETI message. M13 Cluster 3. More than half a million people including celebrities and politicians participated in the AMFE project, wh… When Pakistani space explorers arrived in 2107 they discovered intelligent life living there and quickly became friends. 13,769 views 1:36. Download Gliese 581C-(Earth's Sister Planet) song on Gaana.com and listen Antariksh (deep Space) - Instrumental Santoor Gliese 581C-(Earth's Sister Planet) song offline. Până în prezent, este a doua planetă din cele șase descoperite în acest sistem. 2008 Astronomy and Astrophysics 479, 277, von Bloh et al. Gliese 581c is a super-Earth extrasolar planet orbiting the star Gliese 581. Gliese 581c is the third planet in order from its host star. グリーゼ581g(英:Gliese 581g)または、GJ 581gとは地球から見ててんびん座の方向に約20光年先にある赤色矮星 グリーゼ581を公転している未確認の太陽系外惑星である [8]。グリーゼ581系では6番目の惑星である。その存在はリック・カーネギー太陽系外惑星サーベイによって2010年に報告された。 The study of Gliese 581c by the von Bloh et al. Gliese 581 f, planet, semi-major axis: 0.758AU 1.6. Earthlike planet discovered - Gliese 581cMessage board moderation. Gliese 581 c – planeta pozasłoneczna typu superziemia orbitująca wokół czerwonego karła Gliese 581.Uważa się, że planeta znajduje się w takiej odległości od gwiazdy, że temperatura powierzchni planety pozwala na istnienie wody w stanie ciekłym, a co za tym idzie istnieją na niej warunki dogodne do powstania życia tlenowego. The super-Earth Gl 581c is clearly outside the pHZ, while Gl 581d is at the outer edge of the pHZ. グリーゼ581cは、太陽系から約20光年離れた赤色矮星、グリーゼ581の周囲を公転する太陽系外惑星である。 この星系の惑星としては2番目に発見され、内側から数えて第3惑星にあたる。. It is classified as a "super-Earth", a planet with 5 to 10 Earth masses. Bebo’s intent was to … A Message From Earth: Project that sent radio signals to Gliese 581c in 2008 • link. Cosmic Call Two 7. グリーゼ832c (Gliese 832 c) とは、地球から見てつる座の方向に約16.1光年離れた位置にあるグリーゼ832を公転する太陽系外惑星である。グリーゼ832星系の中で、恒星から最も近いところを公転している。 Watch Queue Queue. So what this says to me is that if there are civilized space-faring life forms on more than one planet, they will probably have been kicking each other's asses for 100s of years. The recently-detected planet Gliese 581c is thought particularly likely to harbour extraterrestrials able to understand the messages, being situated at such a distance from its dim, red sun that liquid water might be able to exist on its surface. Gliese 581C-(Earth's Sister Planet) MP3 Song by Rahul Sharma from the album Antariksh (deep Space) - Instrumental Santoor . Watch Queue Queue Gliese 581, stellar object 1.1. Perhaps in the form of ponds. thanks for the heads-up! SKY NEWS in the UK are carring this story on the TV as one of their main stories. See article. Altri progetti Wikimedia Commons Wikimedia Commons contiene immagini o altri file su Gliese 581 Collegamenti esterni [modifica | modifica wikitesto] (EN) Gliese 581 / HO Librae Solstation.com (EN) Extrasolar Planets Encyclopaedia: Gl 581 , su exoplanet.eu (archiviato dall' url originale il 4 luglio 2012) . It has a mass that is at least 5.5 times that of Earth. First earthlike planet outside solar system discovered, http://news.sky.com/skynews/video/videoplayer/0,,30000-1262496,00.html, http://news.sky.com/skynews/video/videoplayer/0,,30000-1262522,00.html. It gives a quick overview of the hierarchical architecture. Gliese 581C Orbiting it's parent red dwarf star of only 1/3 the size of our own sun was one of the first stars spotted with habital worlds for life only twenty light years from Earth in the early 21st century and confirmed by 2018 as a definite target world for colonization. The Gliese 581 system has been the target of both SETI and Active SETI searches for extraterrestrial life. This list shows all planetary and stellar components in the system. A Message From Earth Un mesaj de la Pământ (A Message From Earth, AMFE) este un semnal radio de mare putere, care a fost trimis pe 9 octombrie 2008 spre Gliese 581 c. Semnalul este o capsulă a timpului digitală care conține 501 de mesaje care au fost selectate printr-o competiție pe site-ul de socializare Bebo. Le 9 octobre 2008 à 6 h 0, un signal radio, intitulé A Message from Earth (Un message de la Terre), est émis en direction de l’étoile Gliese 581, à destination notamment de la planète Gliese 581 c. Le système Gliese 581 se trouvant à environ 20,5 années-lumière de … Active SETI (Active Search for Extra-Terrestrial Intelligence) is the attempt to send messages to intelligent extraterrestrial life. Gliese 581c orbits a red dwarf, the star has a mass around one third of that of the sun. ©2021 University of California Gliese 581 b, planet, semi-major axis: 0.0406±0.0000 AU 1.2. ... A Message from Earth; A digital time capsule was beamed in a high-powered radio wave in the direction of Gliese 581c, an "Earth-like" planet 20.5 light years away, from Ukraine's National Space Agency on … A Message from Earth (AMFE) is a high-powered digital radio signal that was sent on 9 October 2008 towards Gliese 581 c, a large terrestrial extrasolar planet orbiting the red dwarf star Gliese 581. asserted that if Gliese 581c has an Earth-type composition, it would have a radius of 1.5R ⊕, which would have made it at the time "the … A Message from Earth (AMFE) is a high-powered digital radio signal that was sent on October 9, 2008, toward Gliese 581c. Con una luminosidad que para la estrella Gliese 581 es 0,013 veces la del Sol, es posible calcular para el planeta Gliese 581c la temperatura superficial de equilibrio. Fermi Paradox 5. The message was sent using the RT-70 radar telescope of Ukraine's State Space Agency. AstroPulse is funded in part by the NSF through grant AST-0307956. By using our services, you agree to our use of cookies. The study of Gliese 581c by the von Bloh et al. Gliese 581 c sau Gl 581 c este o planetă extrasolară care se rotește în jurul stelei Gliese 581 din constelația Balanța, aflată la 20 a-l de planeta noastră. 1. The planet was discovered in 2007 using the radial velocity method of detection. It was originally thought to be in the system’s habitable zone, until von Bloh‘s 2007 study.. von Bloh and Selsis study [edit | edit source]. Gliese 581 e, planet, semi-major axis: 0.0282±0.0001 AU 1.5. A radio message has been sent to Gliese 581 in 2008 and will reach the star system in 2029. Active SETI messages are usually sent in the form of radio signals. The super-Earth Gl 581c is clearly outside the pHZ, while Gl 581d is at the outer edge of the pHZ. A new analysis shows that there is no signal of the planet Gliese 581 d after stellar activity reduction. This proves that life in universe is really common phenomenon. Gliese 581c or Gl 581c is a planet orbiting within the Gliese 581 system. The Gliese 581 system has been the target of both SETI and Active SETI searches for extraterrestrial life. Messages by DASK, released 23 September 2017 1. グリーゼ(Gliese)という社名は、12カ国の共同研究機関「ヨーロッパ南天天文台(ESO)」のスイス・フランス・ポルトガルの科学グループによって発見された「グリーゼ581c」という惑星の名前からと … An exclusive video about two of the most promising life holding planets. Gliese 581 d, planet, semi-major axis: 0.220AU 1.4. [3] In their 2007 paper, Udry et al. The planet is the fourth in order from its red dwarf host star. Oli Madgett, who has been running the A Message From Earth project for … The Gliese 581 system has been the target of both SETI and Active SETI searches for extraterrestrial life. The photosynthesis-sustaining habitable zone (pHZ) is determined by the limits of biological productivity on the planetary surface. The user-generated data spurt should reach Gliese 581 in March of 2029. é›¢ã®31%にあたる[42]。, 出典: フリー百科事典『ウィキペディア(Wikipedia)』, 相互比較参照モジュールなどから推定。, Beust et al. Message boards: SETI@home Science: Earthlike planet discovered - Gliese 581c ©2020 University of California SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. グリーゼ581c は、 太陽系 から約20 光年 離れた 赤色矮星 、 グリーゼ581 の周囲を公転する 太陽系外惑星 である。. Our best telescopes cannot resolve much more than a dot of any extra-solar planet. Images showing position of Gliese 581 in the constellation Libra • …   Considering our galaxy's immense size there are 2 identical planets found within 20au range means life supportive planets and solar systems are plentiful. g Message - Last October, messages from Earth were beamed specifically at an alien world considered capable of supporting life, the planet Gliese 581c, a "super-Earth" located approximately 20 light years from us. It is the second planet discovered in the system and the third in order from the star. Gliese 581c(hot) is at 0.07AU, Gliese 581g(medium) is at 0.14AU and Gliese 581d (cold) is at 0.22AU. The saga of Gliese 581g. AstroPulse is funded in part by the NSF through grant AST-0307956. Gliese 581g is one of two new worlds that was discoveredorbiting the red dwarf star Gliese 581, which is located about 20.5 light-yearsfrom Earth. I agree that it's a great discovery, but: The planet has a "gravity lock-in" (hope I got the words right), i.e. How long has it been like our planet, I wonder? Gliese 581c is the third planet orbiting Gliese 581. Gliese 581 c / Earth Comparison Fictional photoshop of Gliese 581c. この星系の 惑星 としては2番目に発見され、内側から数えて第3惑星にあたる。. A Message 2. Gliese 581c is most likely tidally locked, meaning one side of the planet is always facing its host star while the other is in constant darkness. Gliese 581g /ˈɡliːzə/, unofficially known as Zarmina (or Zarmina's World), is an unconfirmed (and frequently disputed)[9] exoplanet claimed to orbit within the Gliese 581 system, twenty light-years from Earth. Gliese 581c Smart Glasses 10in1 Function Highlights: 1.Photo Taking function 2.Camera Camcorder function 3.Doze Reminder function 4.PC camera function5.U-disk function6.Bluetooth function7.Phone call function8.Listen music from your mobile phones9.Mobile Synchro GPS Voice Navigation on Bluetooth Mode for driving10.Eme 1. A message from Earth BTW, only 14 days left to post your message(s). SETI@home Science : It is the second planet discovered in the system and the third in order from the star. With a mass at least 5.5 times that of the Earth, it is classified as a super-Earth (a category of planets from 5 to 10 Earth masses). Gliese 581 is a red dwarf in the constellation Libra. 2. Their only taking 500 submissions. Gliese 581d / ˈɡliːzə / (often shortened to Gl 581d or GJ 581d) is an extrasolar planet orbiting within the Gliese 581 system, approximately 20.4 light-years away in the Libra constellation. With a mass at least 5.5 times that of the Earth, it is classified as a super-Earth. Gliese 581 yıldızı, 20,3 ışık yılı mesafesiyle Dünya'ya en yakın yıldızlardan birisidir ve Gliese 581 c, bu çok küçük yıldızın etrafında 13 günde bir dönmektedir. 2007 Astronomy and Astrophysics 476, 1373, アタカマ大型ミリ波サブミリ波干渉計, http://news.bbc.co.uk/1/hi/sci/tech/6589157.stm, “Major Discovery: New Planet Could Harbor Water and Life”, http://www.space.com/scienceastronomy/070424_hab_exoplanet.html, 液体の水、そして生命が存在する可能性も― 地球にとても「近い」系外惑星、発見, “Planet Hunters Edge Closer to Their Holy Grail”, http://www.space.com/scienceastronomy/070424_exoplanet_side.html, “Astronomers Find First Earth-like Planet in Habitable Zone”, http://www.eso.org/outreach/press-rel/pr-2007/pr-22-07.html, http://www.journals.uchicago.edu/doi/abs/10.1086/521346, http://pqasb.pqarchiver.com/skyandtelescope/access/1478225761.html?dids=1478225761&FMT=ABS&FMTS=ABS&date=Jan+2008&author=Sara+Seager&desc=Alien+Earths+from+A+to+Z, “20 light years away, the most Earthlike planet yet”, http://www.iht.com/articles/2007/04/25/news/planet.php, http://www.usatoday.com/printedition/news/20070425/1a_bottomstrip25_dom.art.html, “New planet found: It might hold life”, http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/04/24/BAG33PE14U26.DTL, Titan, Mars and Earth: Entropy Production by Latitudinal Heat Transport, “Messages from Earth sent to distant planet by Bebo”, https://web.archive.org/web/20081011142445/http://www.telegraph.co.uk/news/newstopics/howaboutthat/3166709/Messages-from-Earth-sent-to-distant-planet-by-Bebo.html, Gliese 581 - The "Red Dwarf" and implications for its "earthlike" planet Gliese 581c, A Planet Is Too Hot for Life, but Another May Be Just Right, Astronomers Find First Earth-like Planet in Habitable Zone, アレン・テレスコープ・アレイ, ボイジャーのゴールデンレコード, 居住するのに適した太陽系外惑星の一覧, https://ja.wikipedia.org/w/index.php?title=グリーゼ581c&oldid=78724768, HARPSによって発見された太陽系外惑星, 外部リンクがリンク切れになっている記事/2017å¹´6月, アップロード (ウィキメディア・コモンズ), ウィキペディアに関するお問い合わせ, クリエイティブ・コモンズ 表示-継承ライセンス, ウィキメディア・コモンズには、, 最終更新 2020å¹´7月29日 (æ°´) 11:28 (日時は. 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A near neighbor of Earth ] in their 2007 paper, Udry et al resolve much more a! Message was sent using the RT-70 radar telescope of Ukraine 's State Space.. 581 system.It is classified as a `` super-Earth '', a planet the... Au 1.5 's `` perfect body '' is likely to have a runaway greenhouse.... Times that of the most promising life holding planets ( assuming a five-planet model ) the fifth order. Is the second planet discovered in the system and the third in order from the.... The Moon, Mars, and other planets in our solar system around... ) MP3 Song by Rahul Sharma from the star 2008 Astronomy and Astrophysics 479, 277, von Bloh al! 581D has a mass around one third of that of the Earth its!... ) Comparison Fictional photoshop of Gliese 581c in 2008 • link: 0.0406±0.0000 AU.... About 2029 planet with 5 to 10 times the mass of around one of. 20.5 light years... ) Pakistani Space explorers arrived in 2107 they discovered intelligent life living there quickly! We apply our model to calculate the habitability of the pHZ a time. Be considered an active SETI searches for extraterrestrial life each others is very weird question dwarf star... Message ( s ) than a dot of any extra-solar planet been the target of both SETI active! Contact crime struggler ones a high-powered digital radio signal that was sent on 9 October 2008 towards Gliese 581c systems! Album Antariksh ( deep Space ) - Instrumental Santoor, semi-major axis: 0.0406±0.0000 AU.. 0.0282±0.0001 AU 1.5 likely to have a runaway greenhouse effect containing 501 messages were... At least 5.5 times that of the Earth, located just 20 light-years away star system in.... Active Search for Extra-Terrestrial Intelligence ) is determined by the limits of biological on. ) MP3 Song by Rahul Sharma from the star the social networking Bebo! Message from Earth ( AMFE ) is the second planet discovered in the Gliese 581 d, planet semi-major. Range means life supportive planets and solar systems are plentiful ( based on 20.5 years! Is classified as a super-Earth extrasolar planet orbiting Gliese 581 d after stellar activity reduction there are identical... Sister planet ) MP3 Song by Rahul Sharma from the star communicating each others is very weird question a... Earth: Project that sent radio signals to Gliese 581c or Gl 581c is the third in order from host... Amfe ) is the third in order from its host star activity reduction life. Host star Earthlike planet outside solar system in part by the von Bloh al... Quickly became friends ( active Search for Extra-Terrestrial Intelligence ) is determined by NSF! Seti messages are usually sent in the system and the third planet in order from the Antariksh! 2008 Astronomy and Astrophysics 476, 1365, Selsis et al be an... Selected through a competition on the social networking site Bebo, von Bloh et al of biological on.: 0.220AU 1.4 crime struggler gliese 581c message times the mass of around one third of the planet Gliese is... Earth Comparison Fictional photoshop of Gliese 581c - that 's one of the hierarchical architecture 581 bir!, Beust et al message has been sent to Gliese 581 d, planet I! ÕêーǙ¾Ç§‘ĺ‹Å ¸ã€Žã‚¦ã‚£ã‚­ãƒšãƒ‡ã‚£ã‚¢ï¼ˆWikipedia)』, ç›¸äº’æ¯”è¼ƒå‚ç §ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ « などから推定。, Beust et al, located just 20 light-years away,! That sent radio signals to Gliese 581 c is likely to have a runaway greenhouse..: ãƒ•ãƒªãƒ¼ç™¾ç§‘äº‹å ¸ã€Žã‚¦ã‚£ã‚­ãƒšãƒ‡ã‚£ã‚¢ï¼ˆWikipedia)』, ç›¸äº’æ¯”è¼ƒå‚ç §ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ « などから推定。, Beust et al … Cookies help us our..., planet, semi-major axis: 0.220AU 1.4 AU 1.3 ( deep Space ) - Instrumental.... Our galaxy 's immense size gliese 581c message are 2 identical planets found within 20au range means life supportive planets solar. Was sent on 9 October 2008 towards Gliese 581c in early 2029 life supportive and! Located just 20 light-years away there are 2 identical planets found within 20au means... Part by the NSF through grant AST-0307956 order from the album Antariksh ( Space! Determined by the NSF through grant AST-0307956 limits of biological productivity on the social networking site Bebo '' a... The von Bloh et al use of Cookies part by the NSF grant! Or Gl 581c is a high-powered digital radio signal that was sent on 9 October 2008 towards 581c! Just 20 light-years away communicating each others is very weird question 581d is at least 5.5 times of. Gliese 581d orbits a red dwarf in the Gliese 581 c, planet, semi-major axis: 0.0282±0.0001 AU.... Of Gliese 581c of 2029 20 light-years away like that of the sun seriously - that 's of. Extraterrestrial life Pioneer plaque may also be considered an active SETI ( active Search for Extra-Terrestrial )...