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NASA’s New Horizons Spacecraft Have Detected A Giant Wall At The Edge Of The Solar System

NASA‘s amazing New Horizons spacecraft has aided researchers study a mysterious phenomenon at the very edge of our Solar System, where particles emitted by the Sun and interstellar space interact. This very section, about one hundred times further from the Sun than Earth, is where charge less atoms of Hydrogen from interstellar space interact with charged particles from our Sun. This whole section from our sun is called the heliosphere.

At the very point where the two charged and uncharged particles interact, known as the heliopause, its believed there is a build-up of hydrogen from interstellar space. This makes a kind of “wall”, which sprinkles incoming ultraviolet light.

This wall has been detected before, about 30 years ago, by NASA’s Voyager 1 and 2 spacecraft, and now New Horizons has discovered new evidence for it. A research paper unfolding its discoveries will be issued in Geophysical Research Letters.

Dr Leslie Young from the Southwest Research Institute in Colorado, one of the co-authors on the paper, told Science NewsWe’re seeing the threshold between being in the solar neighborhood and being in the galaxy.

NASA’s New Horizons spacecraft made the discovery by using its Alice UV spectrometer, gathering measurements from 2007 to 2017. It spotted an ultraviolet spark known as a Lyman-alpha line, which is made when solar particles hit hydrogen atoms.
The wall is thought to be at the location of the heliopause. NASA

This ultraviolet glow is detectable all over the Solar System. But at the heliopause, there seems to be an extra source produced by the wall of hydrogen, generating a bigger glow. Beyond the wall there’s more ultraviolet light compared to in front of it, signifying it's being dispersed by the wall.

The scientists wrote in their paper: "This distant source could be the signature of a wall of hydrogen, formed near where the interstellar wind encounters the solar wind."
The theory is not conclusive yet. It’s likely that an alternative cause of ultraviolet light in our galaxy could be producing this background glow. To make further conclusions New Horizons will endure looking for the wall about twice a year.

It is expected that at some point, New Horizons spacecraft will go through the wall, if it is real, so the quantity of ultraviolet light it perceives will decrease. That would deliver some extra indication that the wall is really there.

Voyager 1 and 2 spacecraft’s are both past the wall now, so they’re incapable to make any more findings. But New Horizons is can still detect the more evidence about the wall, if it exists.

If our evaluations are precise, then by the time the mission ends in about 10 to 15 years, it should optimistically have just about made it to the wall. At that stage, we might truly know for certain if it’s there or not.

Updated version of the previous article.

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