First JWST Direct Image of Planet

Blackbody Radiation

Radiation Thermodynamics

• energy density
• pressure

The Planck Spectrum

• review of statistical mechanics
• statistical mechanics of photons
• basic properties
• most awesomest example plotted
• Wein's displacement laws
• brightness/antenna temperature, e.g., as measured by Penzias & Wilson, and modern result (Mather+ 1994)