• propulsion ⪢⪢
http://qindex.info/i.php?x=12673

• propulsion ⪢⪢
http://qindex.info/i.php?x=19477

○○○ spinning top ⪢⪢
In another case, an object resembling a spinning top with no visible propulsion flying at hypersonic speeds. ￫ resemble
http://qindex.info/i.php?x=15560

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