# A spherical interplanetary probe of 0.5-m diameter contains electronics that dis

A spherical interplanetary probe of 0.5-m diameter contains electronics that dissipate 150 W. If the probe surface has an emissivity of 0.8 and the probe does not receive radiation from other surfaces, as, for example, from the sun, what is its surface temperature?
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Susan Yang
Known:
1) probe diameter $D=0.5m$
2)electronics heat rate: $q={E}_{g}=150W$
3) probe surface emissivity $ϵ=0.8$
Use conservation of energy law and Stefan-Boltzmanns