Astrophysique (panorama) 2021/2022 | séance 1

New channel Etienne Parizot: title sample judged 'whole' (This is a full university physics professor's lecture archive—long-form courses, exam corrections, and exercise sessions); passed a second screen for sellers/exam-prep/re-uploads; 0 of 3 sampled transcripts showed teaching, 0 not; titles picked one by one, checked strictly; oEmbed verified.