But normal emissions from a jet or turboprop plane could have the same effect.
2.
I imagine you'd have normal emissions . ( talk ) 17 : 57, 8 December 2007 ( UTC)
3.
Such a feat of astroengineering would drastically alter the observed spectrum of the star involved, changing it at least partly from the normal emission lines of a natural stellar atmosphere to those of black body radiation, probably with a peak in the infrared.
4.
Contrails, or condensation trails, are " streaks of condensed water vapor created in the air by an airplane or rocket at high altitudes . " They are the result of normal emissions of water vapor from piston and jet engines at high altitudes in which the water vapor condenses into visible clouds.
5.
A variable star of a different kind is Tau 4 Serpentis, a cool red giant that pulsates between magnitudes 5.89 and 7.07 in 87 days . This star has been found to display an inverse P Cygni profile, where cold infalling gas on to the star creates redshifted hydrogen absorption lines next to the normal emission lines.
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