Scientists searching for an explanation for an unusually cool area of sky instead discovered a supervoid: an empty spherical blob 1.8 billion light years across Astronomers own discovered what they say is the largest known structure in the universe: an incredibly expansive gap.
The “supervoid”,as it is known, is a spherical blob 1.8 billion light years across that is distinguished by its unusual emptiness.
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Source: theguardian.com