This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects:

Astronomy: Astronomical objects / Solar System Low‑importance This article is within the scope of WikiProject Astronomy, which collaborates on articles related to Astronomy on Wikipedia.AstronomyWikipedia:WikiProject AstronomyTemplate:WikiProject AstronomyAstronomy articles Low This article has been rated as Low-importance on the project's importance scale. This article is supported by WikiProject Astronomical objects, which collaborates on articles related to astronomical objects. This article is supported by Solar System task force (assessed as Mid-importance). Geology Low‑importance Talk:Fifth planet (hypothetical) is part of WikiProject Geology, an attempt at creating a standardized, informative, comprehensive and easy-to-use geology resource. If you would like to participate, you can choose to edit this article, or visit the project page for more information.GeologyWikipedia:WikiProject GeologyTemplate:WikiProject GeologyGeology articles Low This article has been rated as Low-importance on the project's importance scale.

This is an article on the history of astronomy, not a redirect page. This article focuses on the various planets which historically have been acknowleged as the fifth. The planet known as Jupiter is currently acknowleged as the 5th planet from the sun, not including minor or dwarf planets.

No! The theories behind Phaeton and Planet V are vastly different. Phaeton was the hyp raw planet for an explosion producing the asteroid belt. Planet V was (is) the hyp planet that disrupted an already existing asteroid-belt-deLuxe (big) to splatter asteroids all over the inner planets causing the late heavy bombardment around 4100 to 3800 Myr ago. Said: Rursus ☻ 13:53, 10 November 2007 (UTC) reply

The link tells me nothing about what is being discussed in this article. I suspect is a a cross-wiring of topics. I shall now de-link. Huw Powell ( talk) 08:32, 7 October 2010 (UTC) reply

Hello fellow Wikipedians,

I have just modified one external link on Fifth planet (hypothetical). Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

• Added archive https://web.archive.org/web/20060520185324/http://aa.usno.navy.mil/hilton/AsteroidHistory/minorplanets.html to http://aa.usno.navy.mil/hilton/AsteroidHistory/minorplanets.html

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

This message was posted before February 2018. After February 2018, "External links modified" talk page sections are no longer generated or monitored by InternetArchiveBot. No special action is required regarding these talk page notices, other than regular verification using the archive tool instructions below. Editors have permission to delete these "External links modified" talk page sections if they want to de-clutter talk pages, but see the RfC before doing mass systematic removals. This message is updated dynamically through the template {{ source check}} (last update: 18 January 2022).

• If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
• If you found an error with any archives or the URLs themselves, you can fix them with this tool.

Cheers.— InternetArchiveBot ( Report bug) 13:25, 30 September 2017 (UTC) reply