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English: Comparison of several possible sizes for the exoplanet Gliese 581 g with the Solar System planets Earth and Neptune, using approximate models of planetary radius as a function of mass[1] for several possible compositions, based on mass reported in the Open Exoplanet Catalogue[2] as of 2014-06-27. Models include:
 
water world with a rocky core, composed of 75% H2O, 3% Fe, 22% MgSiO3
 
hypothetical pure water (ice) planet, the largest size for Gliese 581 g without a significant H/He envelope
 
rocky terrestrial "Earth-like" planet, composed of 67% Fe, 32.5% MgSiO3
 
hypothetical pure iron planet, Gliese 581 g's theoretical smallest size

Gliese 581 g is not likely to be smaller than the iron planet, and will be considerably larger than the water planet if significant H or He is present. For non-transiting planets, all modeled sizes will be underestimates to the extent that the planet's actual mass is larger than the reported minimum mass.

  1. ↑ Seager, S.; M. Kuchner, C. A. Hier-Majumder and B. Militzer (2007). "Mass–radius relationships for solid exoplanets". The Astrophysical Journal 669: 1279–1297. DOI:10.1086/521346. Retrieved on 2015-11-14.
  2. ↑ Open Exoplanet Catalogue (2015-11-14). Retrieved on 2015-11-14.
Date
Source Own work, incorporating public domain images for reference planets (see below)
Author Aldaron, a.k.a. Aldaron
Other versions
  • Exoplanet discoveries, by year; color-coded by discovery method
    Exoplanet discoveries, by year; color-coded by discovery method
  • Scatter plot of exoplanet period and mass data; color-coded by discovery method
    Scatter plot of exoplanet period and mass data; color-coded by discovery method
  • Exoplanet mass-radius scatter plot, emphasizing super-Earths
    Exoplanet mass-radius scatter plot, emphasizing super-Earths
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Resizing to produce appropriately scaled Earth comparison image. The original can be viewed here: The Earth seen from Apollo 17.jpg: . Modifications made by Aldaron.

This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Resizing to produce appropriately scaled Neptune comparison image. The original can be viewed here: Neptune.jpg: . Modifications made by Aldaron.

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Date/TimeThumbnailDimensionsUserComment
current13:27, 27 June 2014Thumbnail for version as of 13:27, 27 June 20141,040 × 480 (218 KB)AldaronUpdate as of OEC version 0bdcbee.
20:10, 4 October 2010Thumbnail for version as of 20:10, 4 October 20101,040 × 480 (216 KB)Aldaron{{Information |Description={{en|1=TBD}} |Source={{own}} |Author=Aldaron |Date= |Permission= |other_versions= }}

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