Two Fermi bubbles (purple) extend 25,000 light-years in each direction from the Milky Way's center, hinting at a long-ago black hole explosion in the region. (Image credit: NASA Goddard)
Two of the most amazing structures in our galaxy have become even more mysterious.
Rising above and below the center of the Milky Way like a colossal hourglass, the enigmatic Fermi Bubbles tower over our galaxy. These enormous double spheres of hot plasma have been spewing out from the galactic center for millions of years. They currently span about 50,000 light-years, or half the length of the Milky Way.
Now, scientists studying these mysterious bubbles using the National Science Foundation's Green Bank Telescope in West Virginia have made a shocking discovery: deep within the super-hot bubbles are huge clouds of cold hydrogen gas that have somehow managed to survive the extreme conditions.
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Sourse: www.livescience.com
