WSW (World Space Week) is observed annually from October 4 to 10 in different parts of the world.
The Theme of the year 2018 is "Space Unites the World”
World Space Week is officially described as "an international celebration of science and technology, and their contribution to the betterment of the human condition".
On December 6, 1999, the United Nations General Assembly declared World Space Week as an annual event.
The selection of these dates was based on the recognition of two significant dates in space history.
04 October 1957 - The launch of the 1st ever Earth satellite (human-made) called Sputnik 1
10 October 1967 - The day of the Outer Space Treaty signing.