Article first published online: 3 JUN 2011
©1985. American Geophysical Union. All Rights Reserved.
Eos, Transactions American Geophysical Union
Volume 66, Issue 26, page 515, 25 June 1985
How to Cite
1985), Planetary Interiors, Eos Trans. AGU, 66(26), 515–515, doi:10.1029/EO066i026p00515-04.(
- Issue published online: 3 JUN 2011
- Article first published online: 3 JUN 2011
- Cited By
The effective definition of a planet is a body too small to sustain nuclear reactions in its interior, but large enough that its thermal decay time is more than five billion years, the age of the solar system. By this definition, there are fifteen planets in the solar system: all the conventional planets but Pluto plus the seven large satellites. The evolution of a planet is rather insensitive to its dynamical circumstances (with one striking exception); once a planet is formed, evolution is largely controlled by its interior.