Does Our Solar System Have A Wall?
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29 Feb 2024
According to the BBC Science Focus, Our Solar System has a boundary called the heliopause
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The heliopause is the region where the solar wind is no longer strong enough to push back the wind of particles coming from distant stars
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The hot, tenuous solar wind plasma gives way to the colder, denser interstellar medium at the heliopause
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The heliopause marks the boundary between the Solar System and interstellar space
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It is the edge of the heliosphere, the bubble of space in which the Sun's magnetic field and particle emissions dominate
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The heliosphere lies at about 120 astronomical units from the Sun in the direction facing the interstellar wind
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Voyager 1 and Voyager 2 spacecraft crossed the Sun's heliopause in 2012 and 2018 respectively
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Just beyond the heliopause, the temperature of the interstellar medium is extremely hot
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This region is called the wall of fire, but it is misleading because the plasma here is very diffuse
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