Archive for blue giant

8. Alnitak

Posted in 12 Days of Johnny Mackintosh, Space, star blaze with tags , , , , on January 2, 2010 by keithmansfield

“Alnitak is a binary system that, from Earth, appears as the left-most star of Orion’s belt.” p.91

Credit: Digitized Sky Survey, ESA/ESO/NASA FITS Liberator; colour composite: Davide De Martin (Skyfactory)

For me, the star of the winter night sky is the constellation Orion. The three stars of its belt, coupled with the hunter’s sword, make it one of the most recognizable objects in the heavens. Alnitak, the leftmost star, is actually a binary system made up of two blue suns, one a supergiant and the other a large companion star. Both of these are known as “type O” by astronomers, meaning they emit large amounts of radiation and so produce especially strong stellar winds. Perhaps if we took yesterday’s solar sail there, it would fly especially well.

I like to imagine a sunset on a planet orbiting Alnitak, perhaps the beautiful blue blaze reflected in a calm ocean, a line leading all the way to the observers on the sea shore, with the many nearby nebulae appearing in the sky overhead.

Tomorrow we’re back to Earth with a vengeance – it’s off to New York!