Spoken in 3 clips from 3 channels · B1–C1
01 / 3TED-Ed≈ approximate level B12:35–2:42 , , , .
02 / 3Big Think≈ approximate level C10:51–0:56
, .
03 / 3TED≈ approximate level C13:13–3:17
, .
Keep “astrophysicist” until you know it
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3 clips · 3 channels