Continuing our top 10 ranges, today we will write about top 10 largest cities in the world by land area.
With the help NASA’s Spitzer Space Telescope astronomers can see the glowing emerald nebula, called RCW 120, which like the glowing ring wielded by the superhero Green Lantern. Astronomers believe rings like this are actually sculpted by the powerful light of giant “O” stars, which are the most massive type of star known to exist.This region of hot gas and glowing dust can be found in the dark clouds encircled by the tail of the constellation Scorpius. At the center of this ring are a couple of giant stars whose intense ultraviolet light carved out the bubble.
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