Astredita

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Astredita, you are invited to the Teahouse

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Please stop reverting me

I'm cleaning up the links so that User:Citation bot can properly cite the articles. Please let the bot finish. Headbomb {talk / contribs / physics / books} 22:10, 4 November 2013 (UTC)

40 billion

FOLLOWUP - Seems astronomer Geoffrey Marcy (co-author) is quoted as follows:

Marcy says if you combine that result with this newer study looking at sun-like stars, it suggests that our Milky Way galaxy contains something like 40 billion Earth-sized planets with lukewarm temperatures. "So that's really the stunning number, I think," says Marcy.

ALSO, just now received a recent email message from astronomer Erik Petigura (co-author) as follows:

Hi, Dennis.

Great question! We found that 22±8% of G and K type stars have an 1-2x Earth-size planet in the habitable zone. Converting that into a number of planets requires multiplying by the number of stars in the Galaxy. Astronomers quote different total numbers of stars in the Milky Way. Most say 200 billion stars. But one often hears 100 billion and sometimes 400 billion. It's not well known.

About 1/4 of the stars are GK "sunlike" stars. So, adopting 200 billion stars in total, the Milky Way has about 50 billions sun-like (GK) stars. Of those, 22% have a planet 1-2X the size of Earth in their habitable zones. Thus we have 22% of 50 billion suns, coming to 11 billion Earth-size planets in the habitable zones of the sun-like stars in the Milky Way.

If you include the red dwarf stars, the vast majority, the total comes to 40 billion Goldilocks planets.

Cheers,

Erik

On Nov 5, 2013, at 2:00 PM, Dr. Dennis Bogdan <drbogdan@comcast.net> wrote:

Hello Erik,

I'm a Wikipedia editor currently involved with some astronomy articles - Question (if possible) => how many habitable earth-like (or "earth-sized"?) exoplanets are estimated to be orbiting sun-like stars in the Milky Way Galaxy? - seems the media has reported "40 billion" ( ref => http://www.nytimes.com/2013/11/05/science/cosmic-census-finds-billions-of-planets-that-could-be-like-earth.html - some editors on Wikipedia think the estimated number may be different (estimates range from 8.8 billion to 100 billion) -

Thanking you in advance for your reply - Enjoy! :)

Dennis

in any case - hopefully, some of this helps in some ways - Enjoy! :) Drbogdan (talk) 22:38, 5 November 2013 (UTC)

FWIW - a supporting citation for "11 billion" earth-sized exoplanets orbiting sun-like stars in the Milky Way Galaxy seems to be => < ref name="LATimes-20131104">Khan, Amina (November 4, 2013). "Milky Way may host billions of Earth-size planets". Los Angeles Times. Retrieved November 5, 2013.</ref> - Enjoy! :) Drbogdan (talk) 23:49, 5 November 2013 (UTC)

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March 2014

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Kepler

• See User talk:Anthony Appleyard#kepler. Anthony Appleyard (talk) 21:33, 17 April 2014 (UTC)

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Invitation

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Proposed deletion of WISE 2000+3629

The article WISE 2000+3629 has been proposed for deletion because of the following concern:

Per StringTheory11's rationale on duplicate article of same subject (WISE J2000+3629). This brown dwarf is not visible to the naked eye, is not in a prominent catalog such as Messier, NGC, or Caldwell, has no coverage in independent studies and was discovered long after 1850.

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Please consider improving the article to address the issues raised. Removing {{proposed deletion/dated}} will stop the proposed deletion process, but other deletion processes exist. In particular, the speedy deletion process can result in deletion without discussion, and articles for deletion allows discussion to reach consensus for deletion. 189.25.241.15 (talk) 03:47, 20 September 2015 (UTC)

ArbCom elections are now open!

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Exoplanet

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Nomination for deletion of Template:Exoplanet Pages

Template:Exoplanet Pages has been nominated for deletion. You are invited to comment on the discussion at the template's entry on the Templates for discussion page. Frietjes (talk) 20:12, 20 December 2016 (UTC)