The atmospheric gases in the thermosphere are heated pick the best one.

directly by the sun

by the mesosphere

by meteors

by radiation from the earth's surface

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

the transfer of heat by electromagnetic radiation is called thermal radiation . it is usually carried out by electromagnetic waves in an energy range just below the visible spectrum, which is the infrared range.

so the answer would be radiation.

: )