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A proliferation of space junk is blocking our view of the cosmos, research shows Christopher Ingraham © NASA/Space Telescope Science Institute A Starlink satellite leaves a streak of light across this image taken on November 2, 2020, by Hubble's Wide Field Camera 3. (NASA/Space Telescope Science Institute) The rapidly growing cloud of satellites and space junk orbiting the earth is beginning to block our view of the universe around us, according to new research. Each individual object in orbit, from the tiniest bits of space garbage to the largest man-made satellites, ...

That's incredible. We're 26,000 light years from the galaxy's center, but these structures are so huge they cover a significant fraction of our sky. However, they emit no visible light we know of, so we can't see them by eye. Zoom In They appear to be bubbles, thin-walled structures filled with hot gas. However, hot gas on its own can't make gamma rays. Most likely there are powerful shock waves as the gas plows into the thin material floating around just outside our galaxy, as well as strong magnetic fields locked in with the gas; together these can accelerate subatomic particles to incredib...