NASA researchers have discovered two massive and mysterious bubbles that could be the remnant of an eruption from a gigantic black hole at the centre of our galaxy.
One theory is that the bubbles could have formed from a massive burst of star formation that could have occurred in the centre of the Milky Way, creating a massive cloud of energy and gas.
But, other theory states that the super-sized massive black hole at the centre of the galaxy gulped down something big, and then released an energy burp that resulted in the emergence of the bubbles.
Scientist David Spergel, of Princeton University in New Jersey, said that it could have happened here too.
Speaking on the topic, Spergel added, "We have a black hole at the centre of our galaxy that is four million times the mass of the sun."
The two gamma-ray bubbles, which extend 25,000 light-years north and south of the galactic center, were discovered when NASA researchers were processing images captured by its Fermi Gamma-ray Space Telescope. NASA's Fermi Gamma-ray Space Telescope captures detailed pictures of the sky in every three hours.
The bubbles, which may be millions of years old, span more than half of the visible sky, ranging from the constellation of Virgo to the Grus.