Torah isn't in heaven—but science is
This write-up will show that the principle that post sinai heaven can no longer chime in on Torah only applies to inyanei horaah namely determining halacha and not matters that relate to ascertaining scientific phenomena which only indirectly affect halacha but are not halachic decisions per se and as a corollary that whereas Chazal are authoritative in the halachic realm their scientific knowledge merely reflects the scientific knowledge of their day The following well-known gemara expresses the concept that once the Torah was given at sinai judaism became closed to celestial input to the extent that even God Himself can no longer weigh in on the halachic process and that although the Rabbis may get it wrong from an objective perspective they still get it right עמד רבי יהושע על רגליו ואמר {דברים ל':י"ב} לא בשמים היא מאי לא בשמים היא אמר רבי ירמיה שכבר נתנה תורה מהר סיני אין אנו משגיחין בבת קול שכבר כתבת בהר סיני בתורה {שמות כ"ג:ב'} אחרי רבים להטות אשכחיה רבי נתן לאלי