Welcome

The 12th International Cosmic Day takes place on November 21, 2023.

International Cosmic Day (ICD) is dedicated to cosmic particles, which constantly surround us but always go unnoticed. So let's spend a day exploring the world of particles coming from outer space and discovering what secrets they hold.

On this day, students, teachers and scientists around the world will come together to talk and learn about cosmic particles. Questions that can be discussed are:

  • What are cosmic particles?
  • Where do they come from?
  • How can they be measured and what can we learn from them?

For the International Cosmic Day 2023 Christian Stegmann, DESY Director of Astroparticle Physics, is greeting all of you!

“I am delighted that what began in 2012, the anniversary year of the discovery of cosmic rays, is now taking place for the 12th time coordinated by DESY”.

Curious about what the ICD is all about? Watch this video about the ICD's 10th anniversary!

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If you want to participate, please register under Registration. In case you have any questions, write us an e-mail at icd@desy.de.

The 12th International Cosmic Day is organized by DESYIPPOG and many national networks and partners.