Talk:Earth

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Frequently asked questions (FAQ)
Q. Why doesn't the article say anything about the apparent uniqueness of life on this planet?
A. At one time the lead said, "Home to millions of species, including humans, Earth is the only place in the Universe where life is known to exist." There were similar assertions in the article body. However, the wording proved too contentious and a stable compromise couldn't be achieved. Instead, it was decided to remove all mention of this point and leave the discussion of life elsewhere to the extraterrestrial life article.[1]
Q. Why doesn't this article give equal weight to young Earth creationism or similar cultural points of view?
A. This article focuses on the scientific consensus about the Earth. Per WP:PSCI, fringe theories about the Earth need not be given equal weight. Such views normally have their own well-developed articles where there is more weight given to presenting the specific philosophies.
Q. Why is the Blue Marble image used in the infobox?
A. There are multiple reasons. The image is iconic, famous and is one of the few true photographic images of Earth. It has also been a featured image since November 2004. Other images may present more detail of the land masses, but they are generally composite or processed images.
Featured article Earth is a featured article; it (or a previous version of it) has been identified as one of the best articles produced by the Wikipedia community. Even so, if you can update or improve it, please do so.
Featured topic star Earth is part of the Solar System series, a featured topic. This is identified as among the best series of articles produced by the Wikipedia community. If you can update or improve it, please do so.
Main Page trophy This article appeared on Wikipedia's Main Page as Today's featured article on April 22, 2010.
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Shape?[edit]

See this discussion. The "Shape" section here says: "The shape of Earth approximates an oblate spheroid". If you go to oblate spheroid you see a diagram with extreme flattening that has no relationship to the Earth's shape at all. In fact, it should reflect what it says in the lead of the Figure of the Earth article: "the sphere is a close approximation of the true figure of the Earth and satisfactory for many purposes".--Jack Upland (talk) 13:00, 3 March 2016 (UTC)

Why Myr but Ga[edit]

wouldn't it be either Ma and Ga or Myr and Gyr. Why right Myr and Ga in the same sentence? — Preceding unsigned comment added by 118.93.5.254 (talk) 07:35, 25 March 2016 (UTC)

No good reason; it should be as you say. The mess is even worse than that, though. In the section above, there is also "mya", which is a geological abbreviation for "million years ago". --JorisvS (talk) 17:16, 25 March 2016 (UTC)

External links modified[edit]

Hello fellow Wikipedians,

I have just added archive links to 2 external links on Earth. Please take a moment to review my edit. You may add {{cbignore}} after the link to keep me from modifying it, if I keep adding bad data, but formatting bugs should be reported instead. Alternatively, you can add {{nobots|deny=InternetArchiveBot}} to keep me off the page altogether, but should be used as a last resort. I made the following changes:

When you have finished reviewing my changes, please set the checked parameter below to true or failed to let others know (documentation at {{Sourcecheck}}).

YesY Archived sources have been checked to be working

YesY Archived sources have been checked to be working

Cheers.—cyberbot IITalk to my owner:Online 06:47, 28 March 2016 (UTC)

First link works, second doesn't. Dhtwiki (talk) 21:43, 28 March 2016 (UTC)
Second link works at article. Somehow the archive link didn't get put here. Dhtwiki (talk) 21:53, 28 March 2016 (UTC)

Problems in Formation subsection[edit]

This article says it took 27 million years for the primordial Earth to form.

The earliest material found in the Solar System is dated to 4.5672±0.0006 billion years ago (Gya).[44] By 4.54±0.04 Gya[33] the primordial Earth had formed.

and

The assembly of the primordial Earth proceeded for 10–20 Ma.[45]

Even though this is referenced to a number of sources, they are pretty old and not exactly in line with current thinking. The current view is that there is no consensus on how long it took, or at least nothing that definition in that time range.

The usual procedure is to count the Theia collision as the last major planet-building event, and to go with the conventional date for that of 38 million years after the beginning of the formation of the solar system (e.g., First Core collapse, etc.). On the other hand, a wide range of other figures are getting kicked around.

For example, in one scenario Earth goes from a speck of cosmic dust to 100 km diameter in less than 100 years. Among the models involved are the "dust bunny" model (fluffy aggregates of cosmic dust), gravitational eddies, pebble accretion, water vapor at temperatures of up to 1500 K getting "adsorbed" (with a "d") (Adsorption) or chemisorbed (Chemisorption) into cosmic dust, making it stickier. On the other hand, many papers still cite 50-100 million years.

The other problem is with the "glancing blow" theory of the Theia impact. It is now generally accepted that it was a direct hit. Zyxwv99 (talk) 19:22, 13 April 2016 (UTC)

Overlinking[edit]

Just to clarify, my edit summary was supposed to link to MOS:OVERLINK, but I messed up the shortcut. There were a million wikilinks in the lead, some for common words, some for words that are explained/linked later in the body, some for expressions that just really didn't need links. It was distracting and made it difficult to read. PermStrump(talk) 20:02, 12 May 2016 (UTC)

Good job! — Gorthian (talk) 00:43, 13 May 2016 (UTC)

[edit]

I was just looking through unicode tables, and noticed they use the above symbol in the sequence of symbols for planets in the solar system, yet the article makes no mention of this symbol. Wikipedia even recognizes the symbol means earth, since putting it into the search bar automatically redirects to this article. I was just wondering if anyone knew the story behind this symbol, or could add it to the Cultural and Historical Viewpoint section. Unless I misunderstood something about semi-protection in articles I should be able to do it myself, but I can't --Astrocom (talk) 18:28, 20 July 2016 (UTC)

Astronomical symbols lists it as one of the two distinct symbols for Earth, so it would make sense to include information about it. --JorisvS (talk) 18:36, 20 July 2016 (UTC)