Voyager 1 crossed the edge of the Sun’s protective bubble and entered interstellar space, but instead of fading gently into the void it met a strange, porous boundary scientists had not anticipated
For six years one of Voyager 1’s instruments had counted the same steady drizzle of low-energy particles streaming off the Sun. On 25 August 2012, over a matter of days, that drizzle fell away and…
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