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Loading contentMeasuring the light a planet itself emits — usually its thermal glow — to probe the temperature structure and composition of its dayside. Because the planet's emission is measured against the star, it is easiest for hot planets, and it reveals whether temperature rises or falls with altitude in ways transmission spectra cannot.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.