User talk:Astredita

Welcome!
Hello, Astredita, and welcome to Wikipedia! Thank you for your contributions, especially what you did for Retrograde and prograde motion. I hope you like the place and decide to stay. Here are a few links to pages you might find helpful: Please remember to sign your messages on talk pages by typing four tildes ( ~ ); this will automatically insert your username and the date. If you need help, check out Questions, ask me on my talk page, or ask your question on this page and then place  before the question. Again, welcome! —  Reatlas  (talk)  00:33, 10 August 2013 (UTC)
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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  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"> - Enjoy! :) Drbogdan (talk) 23:49, 5 November 2013 (UTC)

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 * ipac.caltech.edu/docs/exoplanet_criteria.html Exoplanet Criteria for Inclusion in the Archive, NASA Exoplanet Archive

Kepler

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

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Proposed deletion of WISE 2000+3629


The article WISE 2000+3629 has been proposed for deletion&#32; 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 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)

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Exoplanet
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Nomination for deletion of Template:Exoplanet Pages
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