Mysterious 'Interstellar Tunnel' Found in Our Local Pocket of Space

09 November 2024
By Michelle Starr



A 3D model of the solar neighborhood, within the Local Hot Bubble. (Michael Yeung/MPE)


The Solar System's little pocket of the Milky Way is, interestingly enough, exactly that. Our star resides in an unusually hot, low-density compartment in the galaxy's skirts, known as the Local Hot Bubble (LHB).
Why it's not called the Local Hot Pocket is anyone's guess; but, because it's an anomaly, scientists want to know why the region exists.

Now a team of astronomers has mapped the bubble, revealing not just a strange asymmetry in the pocket's shape and temperature gradient, but the presence of a mysterious tunnel pointing towards the constellation Centaurus.

The new data about the shape and heat of the bubble supports a previous interpretation that the LHB was excavated by exploding supernovae that expanded and heated the structure, while the tunnel suggests that it may be connected to another low-density bubble nearby.

The LHB is characterized by its temperature. It's a region thought to be at least 1,000 light-years across, hovering at a temperature of around a million Kelvin. Because the atoms are spread so thin, this high temperature doesn't have a significant heating effect on the matter within, which is probably just as well for us. But it does emit a glow in X-rays, which is how astronomers identified it, years ago.

More:
https://www.sciencealert.com/mysterious-interstellar-tunnel-found-in-our-local-pocket-of-space