Planck's hypothesis that energy is radiated and absorbed in discrete "quanta" (or energy packets) precisely matched the observed patterns of black-body radiation.
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In 1804, Leslie observed that a matte black surface radiates heat more effectively than a polished surface, suggesting the importance of black-body radiation.
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Quantum theory also provides accurate descriptions for many previously unexplained phenomena, such as black-body radiation and the stability of the orbitals of electrons in atoms.