Yumi Hirahara

@h_yumi

Entrepreneur & working mom in Tokyo. Love Twitter, anything to do with my PC, iPhone & all things beautiful - like my daughter! Japan acct @YHirahara

Funny lines in the sky - a plane maybe. You'd never know how cold it was from the look of the sky!

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1790 days ago

Funny lines in the sky - a plane maybe. You'd never know how cold it was from the look of the sky!

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jkhsquonk 1790 days ago

Those are called "vapor trails" from jets traveling at high altitudes at supersonic speeds.