You’re looking at one of the weirdest things in the known universe. Here are 5 of the wildest factslaps about the Eridanus Supervoid:

1. It’s a Billion Light-Years Wide

This void stretches across a billion light-years—big enough to fit 10,000 Milky Ways side by side with room to spare.

2. It May Explain the Cosmic Cold Spot

This region of the sky is mysteriously colder in the cosmic microwave background, and this giant void might be the reason why.

3. It’s Nearly Empty

The void has up to 30% less matter than average—galaxies, gas, even dark matter are missing. That’s an unprecedented cosmic no-show.

4. Light Loses Energy Traveling Through It

Photons crossing it may cool off due to the Integrated Sachs-Wolfe effect, like cosmic headlights dimming in a bottomless fog.

5. Some Think It’s a Bruise from Another Universe

One fringe theory: the void is a scar from a collision with a parallel universe. No joke—this is a real hypothesis being studied.