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Gliese 581c / ˈ ɡ l iː z ə / (Gl 581c or GJ 581c) is an exoplanet orbiting within the Gliese 581 system. It is the second planet discovered in the system and the third in order from the star . With a mass about 6.8 times that of the Earth , it is classified as a super-Earth (a category of planets with masses greater than Earth's up to ten ...
The Gliese 581 system has been the target of both SETI and Active SETI searches for extraterrestrial life. A Message from Earth (AMFE) is a high-powered digital radio signal that was sent on 9 October 2008, toward Gliese 581c. The signal is a digital time capsule containing 501 messages that were selected through a competition on the social ...
Gliese 581c; Gliese 581d; Gliese 581e; Gliese 581g This page was last edited on 21 January 2021, at 22:02 (UTC). Text is available under the ... Code of Conduct;
With Gliese 581c having a mass of at least 5 Earth masses and a distance from Gliese 581 of 0.073 astronomical units (6.8 million mi, 11 million km), it is on the "warm" edge of the habitable zone around Gliese 581 with an estimated mean temperature (without considering effects from an atmosphere) of −3 degrees Celsius with an albedo ...
The discovery of the extrasolar planet Gliese 581 c by the team of Stéphane Udry at University of Geneva's Observatory in Switzerland was announced on April 24, 2007. [12] The team used the telescope's HARPS spectrograph, and employed the radial velocity technique to identify the planet's influence on the star. [12] [13]
Among them was Gliese 581c (announced April 25, 2007) which at the time, was the most likely candidate for habitability of any extrasolar planet discovered so far. The planet was discovered by analyzing data obtained by the High Accuracy Radial Velocity Planet Searcher (HARPS) on the European Southern Observatory 's 3.6 meter telescope at La ...
Gliese 581 is roughly 0.4 times as big as Sol, but only 0.07 times as far from 581 c, so it appears quite large, 2.85 degrees of arc, about 5.7 times as big as Sol seen from Earth. 581 b, 0.003 times as big as Sol, when transiting, would be about 0.03 AU from 581 c; if Neptune-sized, that means 0.05 degrees, a tenth as big as the moon seen from ...
1.1 Gliese 581c. 4 comments. 1.2 Glass. 2 comments. 1.3 Animal anatomy: 1 comment. 1.4 What is a shaft passer? 16 comments. 1.5 Hypothetical Runaway Greenhouse effect ...