Historical eventOctober 202003

Sloan Great Wall

The Sloan Great Wall, once the largest cosmic structures known to humanity, is discovered by students at Princeton University.

Everything on October 20Original source

In context

When
Monday, October 20 200323 years ago
Category
Historical eventA dated happening — a battle, treaty, launch, discovery, disaster or decision — recorded on this calendar day.
Era
21st century · 2000s
Recorded from
Wikipedia “On this day” feed

At a glance

Dates: From 2003.

What happened

The Sloan Great Wall, once the largest cosmic structures known to humanity, is discovered by students at Princeton University.

October 20 through the years

Other entries on the same calendar day, in order.

  1. 1991Firestorm
  2. 1995Space Shuttle Columbia
  3. 2002Top Gear (2002 TV series)
  4. 2003Sloan Great Wall
  5. 2005UNESCO
  6. 2011Libyan crisis
  7. 2011Libyan civil war (2011)
  8. 2017Syrian civil war
  9. 2022Liz Truss
  10. 20222022 Chadian protests
  11. 2024Prabowo Subianto

Also in 2003

  • September 12Typhoon MaemiTyphoon Maemi, the strongest recorded typhoon to strike South Korea, made landfall near Busan.
  • September 12Steam (service)The first public release of Steam, a distribution service for computer games, was made available for download.
  • September 12United NationsThe United Nations lifts sanctions against Libya after that country agreed to accept responsibility and recompense the families of victim…
  • September 12Iraq WarIraq War: In Fallujah, U.S. forces mistakenly shoot and kill eight Iraqi police officers.
  • September 14Kumba YalaPresident Kumba Ialá (pictured) of Guinea-Bissau was deposed in a bloodless military coup.
  • September 142003 Estonian European Union membership referendumIn a referendum, Estonia approves joining the European Union.
  • November 17Arnold SchwarzeneggerActor Arnold Schwarzenegger's tenure as the governor of California begins.
  • July 13Directorate General for External SecurityFrench Directorate General for External Security personnel aborted an operation to rescue Colombian politician Íngrid Betancourt from FAR…

Everything we record for 2003 →

Sources

Cite this page

“Sloan Great Wall”, What's On This Date, https://whatsonthisdate.com/app/event/sloan-great-wall-2003-october-20, accessed October 27, 2026.

Cite the underlying source as well — the source links above go to the record this entry is adapted from.

Questions about this entry

When did Sloan Great Wall happen?

October 20 2003 — 23 years ago, on a Monday.

Where does this text come from?

Wikipedia “On this day” feed. Summaries are short adaptations that link back to the source, not reprints.

How do I cite this page?

Use the ready-made citation near the sources at the bottom of the page, and follow the source link to cite the underlying record as well.

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