Koma (komet): Perbedaan antara revisi

[[OAO-2]] ('Stargazer') discovered large halos of hydrogen gas around comets.<ref name=o2>[http://www.sal.wisc.edu/~meade/OAO/ Orbiting Astronomical Observatory OAO-2]</ref> Space probe Giotto detected hydrogen ions at distance of 7.8 million km away from Halley when it did close flyby of the comet in 1986.<ref name=Giotto>[http://www.esa.int/Our_Activities/Space_Science/Giotto_overview ESA - Giotto]</ref>

 

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