Big Bang Day is an annual event celebrated on March 21 to mark an important moment in scientific history! This day commemorates the breakthrough that deepened the understanding of the origins of the universe. Big Bang Day specifically honours the discovery of the cosmic microwave background radiation, the faint afterglow of the Big Bang, which serves as one of the strongest pieces of evidence supporting the Big Bang theory. The theory posits that the universe began from a single, extremely hot, and dense point around 13.8 billion years ago, and has been expanding and cooling since then.  What Is the Big Bang Theory? Know All About Astronomer Georges Lemaitre's 'Universe is Expanding' Concept.

On March 21, 2013, the European Space Agency (ESA) released an all-sky map that traced the oldest existing light in the Universe. The significance of the cosmic microwave background lies in the wealth of information it carries about the infancy of the universe. In this article, let’s know more about the Big Bang Day 2025 date and the significance of the annual event. March 2025 Holidays and Festivals Calendar: List of Important Dates and Events in the Third Month of the Year.

Big Bang Day 2025 Date

Big Bang Day 2025 falls on Friday, March 21.

Big Bang Day Significance

Big Bang Day serves as a tribute to scientific curiosity and the pursuit of knowledge. The annual event encourages discussions on the mysteries of the cosmos, inspiring new generations to explore astrophysics and find out the secrets of the amazing universe. On this day, many educational events are held like lectures, or public outreach programs. This day reminds us of humanity’s quest to understand where we come from and how the universe has evolved over billions of years!

(The above story first appeared on LatestLY on Mar 21, 2025 10:29 AM IST. For more news and updates on politics, world, sports, entertainment and lifestyle, log on to our website latestly.com).