Astrophysics (Index)About

rocky planet

(terrestrial planet, telluric planet)
(planet like Earth and Mars, mostly rock)

A rocky planet or terrestrial planet or telluric planet is a planet of mostly rock (e.g., silicates), such as Mercury, Venus, Mars or Earth. Among extra-solar planets, there are also larger such planets, such as those termed super-Earths and mega-Earths.

There is a presumed (and real?) correlation between planets being rocky and the amount of received electromagnetic radiation and stellar wind from the host star, thus how close they are to the star. A very thick atmosphere as per a gas giant would not last if the planet were too close, due to the atmospheric escape factors associated with being close to the host star, for some planets, leaving just the rocky portion as a rocky planet.

There is presumed to be something of an upper limit on the size of rocky planets.

The formation of rocky planets clearly requires elements that can combine to form rocks, and spectral energy distribution (SED) of a star can reveal whether it formed from a molecular cloud with the necessary elements. A star's abundance ratios such as [Fe/Mg] and [Fe/Si] (in bracket notation) hint at the nature of the planets it is likely to form, including whether any would be termed rocky, and what abundances such planets would be likely to possess.


(planet type,exoplanets)
Further reading:
https://en.wikipedia.org/wiki/Terrestrial_planet
https://en.wiktionary.org/wiki/rocky_planet
https://exoplanets.nasa.gov/what-is-an-exoplanet/planet-types/terrestrial/
https://www.physics.unlv.edu/~jeffery/astro/ial/ial_016.html

Referenced by pages:
asteroid
Automated Planet Finder (APF)
barrier
carbon (C)
CHEOPS
core accretion model
dynamo
Earth
Earth analog
exo-Earth
extra-solar planet
giant planet formation
gravitational instability model
habitable zone (HZ)
hydrostatic equilibrium
isolation mass
Kepler-452b
late heavy bombardment (LHB)
lava planet
LHS 1140
magma ocean
mega-Earth
Mercury
metal
metallicity (Z)
mini-Neptune
moon
OGLE-2005-BLG-390Lb
oligarch
pebble accretion
planet
planet demographics
planet formation
planet structure
planet type
ROCKE-3D
rotation period
silicate
super-Earth
surface temperature
Terrestrial Planet Finder (TPF)
tidal locking
Venus
water (H2O)

Index