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NASA Voyager reaches the edge of our solar system and makes unprecedented discovery that humans will never be able to see
Home>News>World News
Published 15:16 23 Jun 2025 GMT+1

NASA Voyager reaches the edge of our solar system and makes unprecedented discovery that humans will never be able to see

This discovery marks a major milestone for the space agency

Gerrard Kaonga

Gerrard Kaonga

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Featured Image Credit: VICTOR HABBICK VISIONS/SCIENCE PHOTO LIBRARY/Getty

Topics: NASA, Space, Science

Gerrard Kaonga
Gerrard Kaonga

Gerrard is a Journalist at UNILAD and has dived headfirst into covering everything from breaking global stories to trending entertainment news. He has a bachelors in English Literature from Brunel University and has written across a number of different national and international publications. Most notably the Financial Times, Daily Express, Evening Standard and Newsweek.

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NASA has revealed that they have sent a man-made machine further than they ever have before, and they said they made an odd discovery in the process.

Back in 1977, NASA sent two space probes into space, Voyager 1 and 2, with the intention of exploring the outer reaches of the solar system.

A rather lofty goal, but the space agency has revealed that not only has it done this, but it found a region of space where things get a little weird.

Essentially, the probes have reached a point where solar winds collide with the interstellar winds and temperatures absolutely skyrocket.

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But first, let's back up. According to the space agency, there are many different ways to define the ‘edge’ of our solar system.

The probes scanners detected massive elevations in temperature outside of the solar system (NASA)
The probes scanners detected massive elevations in temperature outside of the solar system (NASA)

It can be defined as where the planets end, or at the Oort cloud or the boundary of the Sun's gravitational influence where objects may still return closer to the Sun.

But the one way that is most applicable with this Voyager discovery is the edge of the Sun's magnetic field where it pushes up against the interstellar medium, known as the heliopause.

A NASA statement on this read: “The Sun sends out a constant flow of charged particles called the solar wind, which ultimately travels past all the planets to some three times the distance to Pluto before being impeded by the interstellar medium.

"This forms a giant bubble around the Sun and its planets, known as the heliosphere.

“The boundary between solar wind and interstellar wind is the heliopause, where the pressure of the two winds are in balance. This balance in pressure causes the solar wind to turn back and flow down the tail of the heliosphere.”

It is where this balance occurs that scientists were stunned to find such an intense physical effect, massive thermal violence.

Reaching this point, Voyager 1’s probes detected massive spikes in temperature, its sensors registering between 30,000 and 50,000 Kelvin (between 54,000 and 90,000 degrees Fahrenheit).

This region was aptly nicknamed the ‘wall of fire’.

While it is called a ‘wall’, it isn’t really a solid but rather a super hot zone, with very high-energy particles, largely due to the friction between solar and interstellar winds.

The probes were able to pass through it and continues to send Earth data from beyond the wall, beyond the solar system, so who knows what else the probes will discover beyond our local portion of space.

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