Puzzle Page #5: Heliosphere
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Today's Puzzle Answer: Heliosphere
Far, far beyond the orbits of the planets, the linings of a nebulous magnetic bubble form the boundaries of our solar system. Inside those linings is the heliosphere, the region of space carved out by our Sun's magnetic field and inflated by the constant outflow of the solar wind. Outside it is interstellar space.
The heliosphere surrounds all of the planets, stretching at least 10 billion miles to its nearest boundary. Of the spacecraft sent from Earth, only the twin Voyager spacecraft — traveling since 1977 — have been confirmed to cross its boundary.
But the heliosphere's precise shape and size are always changing with fluctuations in the solar wind. Since 2008, NASA's Interstellar Boundary Explorer has been mapping those changes, a legacy soon to be inherited by NASA's Interstellar Mapping and Acceleration Probe, currently expected to launch no earlier than September 2025.
Learn more about how NASA studies our heliosphere.
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