World Space Week runs October 4–10, 2027, a global celebration of space science and exploration. The United Nations created it in 1999, and people around the world take part.
October 4 to 10, Every Year
Every year, from October 4 through October 10. Because the dates are fixed, the starting weekday changes from year to year.
Both dates mark milestones. October 4 recalls the launch of Sputnik 1 in 1957, and October 10 the day the Outer Space Treaty took effect in 1967.
Anyone can register an event, from a classroom or astronomy club to a national space agency, and many events are free to attend.
A UN Week Since 1999
December 6, 1999, is the key date. That’s when the UN General Assembly declared the week, at its 71st plenary meeting of the session.
Resolution 54/68 asked for a celebration each year at the international level, so every country can join.
Sputnik 1 was the first human-made satellite to orbit Earth. The resolution said its launch opened “the way for space exploration.”
Ten years later came the treaty. Its full name covers the exploration and use of outer space, “including the Moon and Other Celestial Bodies.”
Why Space Gets a Week
Inspiring students is a central goal. The Planetary Society says the week aims to spark interest in science, technology, engineering and math.
Its reach is huge. In 2025, nearly 50,000 events took place in more than 100 countries, and organizers call it the largest annual space event on Earth.
Launch is changing fast, and the 2026 theme reflected that. “Rocket Revolution” celebrated the shift from a few government programs to commercial providers and reusable rockets.
New space actors were part of that story too, the Planetary Society noted.
Ways to Join In
Look up first. A clear night is a fine excuse to find a planet or watch for a passing satellite.
- Visit a planetarium or science museum during the week.
- Watch a rocket launch livestream with your family.
- Join or host a stargazing night with a local astronomy club.
- Read about Sputnik and the early space race.
- Build a simple paper or water-bottle rocket with kids.
- Register a school event on the World Space Week website.
Frequently Asked Questions
Who declared World Space Week?
The world body’s main assembly of member states.
Is it only for scientists?
Not at all. Classrooms and families are a big part of it.
Does the theme change?
Yes, a new one is chosen each year.
Why does it start on October 4?
That’s the anniversary of the first satellite launch, which began the Space Age.
Do I need special gear to take part?
No. A book, a video or a look at the night sky works.