- Who
- Hercules-Corona Borealis Great Wall
- What
- 10,000,000,000 light year(s)
- Where
- Not Applicable ()
- When
The Hercules-Corona Borealis Great Wall is a massive structure of galaxies measuring around 10 billion light years across. Its existence was discovered by astronomers charting the locations of gamma ray bursts which had been detected by the Swift Gamma Ray Burst mission. Its discovery was announced on 5 November 2013 and it lies around 10 billion light years from Earth.