A Look to the Heavens
“The Barred Spiral Galaxy, NGC 1365 is one of the most prominent barred galaxies in the sky. It is a supergiant galaxy with a diameter of about 200,000 light years. A massive straight bar runs through this galaxy and contains the nucleus at the centre. It consists mostly of older stars that give a reddish color to the bar. The gravitational perturbation from the bar causes interstellar gas and dust clouds to form a pair of spiral arms that extend from the ends of the bar. Young luminous hot stars, born out of the interstellar clouds, give these arms a prominent appearance and a blue colour. The bar and spiral pattern rotates clockwise, as seen from us. One full turn takes about 350 million years.”- http://www.astronomy-pictures.net/galaxy_pictures.html
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