The researchers adjusted it to accommodate different masses and compositions, and applied it to six known rocky exoplanets with well-measured masses and physical sizes.

They found that the other planets, despite their differences from Earth, all should have a nickel/iron core containing about 30 percent of the planet's mass.

In comparison, about a third of the Earth's mass is in its core. The remainder of each planet would be mantle and crust, just as with Earth, according to a CfA statement.

The model assumes that distant exoplanets have chemical compositions similar to Earth.

This is reasonable based on the relevant abundance of key chemical elements like iron, magnesium, silicon, and oxygen in nearby systems.


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