Historically, a handful of solar system bodies have been counted as the fifth planet from the sun. Under the present definition of a planet, this celestial body is Jupiter. Table of astronomy, from the 1728 Cyclopaedia Astronomy is probably the oldest of the natural sciences, dating back to antiquity, with its origins in the religious practices of pre-history: vestiges of these are still found in astrology, a discipline long interwoven with astronomy, and not completely different from it... Look up sun in Wiktionary, the free dictionary. ... The eight planets and three dwarf planets of the Solar System. ... See lists of astronomical objects for a list of the various lists of astronomical objects in Wikipedia. ... Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ...

Previous fifth planets

• During the early 19th century, when the first four asteroids to be discovered were considered planets, Jupiter was counted as first the sixth and eventually the twentieth planet. The fifth planet at this time was considered the asteroid Ceres. Following the reclassification of the asteroids in their own group, Jupiter became the fifth planet once again. With the 2006 redefinition of planet, Ceres is now considered a dwarf planet

• A hypothetical planet between Mars and Jupiter has long been thought to have occupied the space where the asteroid belt is currently located. Scientists in the 18th century dubbed this hypothetical planet Phaeton. Although mainstream science now regards this idea as an obsolete scientific theory, some fringe elements regard this as theory as credible and even likely. This resurgance is largely based on archeological findings regarding the presence of a planet called Tiamat in the writings of ancient astronomers.

Alternative meaning: Nineteenth Century (periodical) (18th century — 19th century — 20th century — more centuries) As a means of recording the passage of time, the 19th century was that century which lasted from 1801-1900 in the sense of the Gregorian calendar. ... Asteroids is a popular vector-based video arcade game released in 1979 by Atari. ... Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... 1 Ceres (IPA , Latin: ) is a dwarf planet in the asteroid belt. ... The final definition left the solar system with eight planets, pictured above (not to scale) Displays the remaining eight planets with the celestial bodies that have now been designated as dwarf planets. ... Artists impression of Pluto (background) and Charon (foreground). ... See also: List of hypothetical planetary bodies A hypothetical planet is a planet whose existence is not known, but has been inferred from observational scientific evidence. ... Mars is the fourth planet from the Sun in the solar system, named after the Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. ... Atmospheric characteristics Atmospheric pressure 70 kPa Hydrogen ~86% Helium ~14% Methane 0. ... Image of the main asteroid belt between the orbits of Mars and Jupiter. ... (17th century - 18th century - 19th century - more centuries) As a means of recording the passage of time, the 18th century refers to the century that lasted from 1701 through 1800. ... See also: List of hypothetical planetary bodies A hypothetical planet is a planet whose existence is not known, but has been inferred from observational scientific evidence. ... Phaeton, Phaëton, or Phaethon may refer to many different things, all deriving ultimately from the mythological figure. ... Mainstream is, generally, the common current of thought of the majority. ... Science in the broadest sense refers to any system of knowledge attained by verifiable means. ... An obsolete scientific theory is a scientific theory that was once commonly accepted but (for whatever reason) is no longer considered the most complete description of reality by mainstream science; or a falsifiable theory which has been shown to be false. ... Fringe science is a phrase used to describe scientific inquiry in an established field that departs significantly from mainstream or orthodox theories. ... Archaeology or sometimes in American English archeology (from the Greek words αρχαίος = ancient and λόγος = word/speech) is the study of human cultures through the recovery, documentation and analysis of material remains, including architecture, artefacts, biofacts, human remains, and landscapes. ... Zecharia Sitchin is a best-selling author promoting the ancient astronaut theory of mankinds origins. ...

The Planet V theory

Based on simulations, NASA space scientists Chambers and Lissauer have proposed the existence of a planet between Mars and the asteroid belt, going in a successively excentric and unstable orbit, before 4,000 Mya. They connect this planet, which they name Planet V, and it disappearance with the Late Heavy Bombardment episode of the Hadean era. ^{[1] [2]} Chambers and Lissauer also claims this Planet V most probably ended up by crashing into the Sun. The Late Heavy Bombardment (LHB) was a period approximately from 3800 to 4000 million years ago during which the Moon, Earth, Mercury, Venus, and Mars were subjected to many impacts from space. ... The name Hadean refers to the geologic period before 3800 million years ago (mya). ...

Fifth planet in fiction

The concept of a fifth planet which had been destroyed to make the asteroid belt was a popular one in fiction. See Asteroids in fiction#Fifth planet. Asteroids are a common theme in fiction, especially in science fiction. ...

References

2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... November 9 is the 313th day of the year (314th in leap years) in the Gregorian Calendar, with 52 days remaining. ... 2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ... November 9 is the 313th day of the year (314th in leap years) in the Gregorian Calendar, with 52 days remaining. ...

See also

• Ninth planet, historical speculation about a planet beyond Neptune.
• Tenth planet, historical speculation about a planet beyond the orbit of Pluto
• Outer planets of the Solar System in fiction, fictional further planets
• List of solar system bodies formerly considered planets
• List of Hypothetical astronomical objects