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Airbus unveils half-plane, half-copter in quest for speed
Reuters· 3 日前, opens new tab showcased an experimental half-plane, half-helicopter on Wednesday in a quest ...
Webb telescope uncovers merger of two massive black holes from early universe
Bastillepost· 2 日前CAPE CANAVERAL, Fla. (AP) — The Webb Space Telescope has discovered the earliest known merger of bla