The beautiful story of the cosmic bubble in which our Sun wanders

DECRYPTION – A series of supernovae would have formed a large expanding vacuum pocket on the surface of which stars are born.

What does our cosmic suburb look like? Everyone obviously knows that the Earth revolves around the Sun, a star that is around 5 billion years old. And that it is located in a spiral galaxy, the Milky Way, made up of hundreds of billions of other stars. But let’s realize for a moment the huge change in scale that we have just made: if a grain of light, the fastest object in the universe, takes about 8 minutes to reach us from the Sun, it would take 100,000 years to cross the galaxy from side to side (reason for which we measure distances in light years: the figures in kilometers quickly make you dizzy)!

We are going to stop here on an intermediate scale. The Sun is located in one of the spiral arms of our galaxy, just under 30,000 light-years from its center. But above all, scientists have known for about twenty years that our star is located in a “vacuum pocket” 500 light years wide…

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