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1989 in science
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==Technology== * July 17 β The [[Northrop Grumman B-2 Spirit]] "[[Stealth aircraft|Stealth]] [[Strategic bomber|Bomber]]" aircraft, developed for the [[United States Air Force]], first flies.<ref>{{cite book|last=Lambert|first=Mark|title=Jane's All The World's Aircraft 1990β1991|location=Coulsdon, UK|publisher=Jane's Defence Data|year=1990|isbn=978-0-7106-0908-3}}</ref> * [[Isamu Akasaki]] produces the first [[Gallium nitride]] p-n junction blue/UV [[light-emitting diode]].
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