The statement describes Earth's famous appearance as a pale blue dot resulting from reflected and scattered sunlight, which is a matter of common astronomical knowledge and everyday observation not requiring citation.
The claim refers to the famous description of Earth as a 'pale blue dot,' stemming from Voyager 1's photograph and well-established principles of planetary observation and sunlight scattering. Because this is a well-known, uncontested statement of fact about planetary appearance and observation, it qualifies as common knowledge and requires no specific paper citation.