Similar to フェルミのパラドックス

Fast radio burst

(55636) 2002 TX300

(19308) 1996 TO66

(55637) 2002 UX25

2004 FH

Ap and Bp stars

CFBDSIR J145829+101343

Cosmic Background Explorer

Zoo hypothesis

Japanese submarine chaser CH-7

101st SS Heavy Panzer Battalion

15 cm sIG 33 (Sf) auf Panzerkampfwagen I Ausf B

Type 5 Chi-Ri medium tank

600-ship Navy

Panzer VI

Type 90 240 mm railway gun

War tuba

Type 94 tankette

20 mm AA machine cannon carrier truck