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日本很早就有Ｎ—１、Ｎ—２和Ｈ—１等多种火箭，但因性能差，未能进入国际市场。Ｈ—２火箭多次发生发射故障，使日本航天业蒙受极大打击。最新研制的Ｈ－２Ａ火箭虽然也多次发生故障，但日本始终坚持下来，最后获得了成功
Japan has long been a N-1, N-2 and H-1 and other rockets, but because of poor performance, failed to enter the international market. H-2 rocket launch failure occurred many times, the Japanese space industry suffered a great blow. The newly developed H-2A rocket although many failures, but Japan has always adhered to and finally achieved success