NASAのインスタグラム(nasagoddard) - 7月13日 22時02分

Far, far beyond the orbits of the planets lie the hazy outlines of the magnetic bubble in space that we call home.

This is the heliosphere, the vast bubble that is generated by the Sun’s magnetic field and envelops all the planets. The borders of this cosmic bubble are not fixed. In response to the Sun’s gasps and sighs, they shrink and stretch over the years.

Now, for the first time, scientists have used an entire solar cycle of data — 11 years’ worth — from NASA’s Interstellar Boundary Explorer, or IBEX, to study how the heliosphere changes over time.

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