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International Asteroid Day

Celebrate International Asteroid Day and explore the fascinating world of asteroids - learn about their history, composition, and more!

Tuesday
30
June 2026
Last updated February 7, 2026 · by the Holiday Calendar Team
Have an update or spot an error?
YEARLY DATEJune 30
OBSERVED INInternationally
CATEGORYAwareness
SUBCATEGORYPublic Health
INTRO

Introduction

Let's celebrate International Asteroid Day on June 30 to recognize the importance of asteroids and the need to protect our planet from potential impacts! This day was created in 2014 to mark the anniversary of Earth's largest asteroid impact, which occurred in 1908 near Tunguska, Siberia. Although this event caused significant destruction, it also highlighted the need for continued research and education about asteroids so that we can better understand their behaviour and use them to our benefit. Join us in celebrating this important day with activities that explore outer space!

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TIMELINE

International Asteroid Day Timeline

Tunguska Event

The largest Earth's asteroid impact event happened near Tunguska, Siberia, leading to significant destruction and marking the importance of understanding asteroid behavior.

Alvarez Hypothesis

Luis Alvarez and his son Walter proposed the theory that an asteroid impact caused the extinction of dinosaurs, highlighting the potential catastrophic impact of asteroids.

NASA's Asteroid Search Initiative

NASA started a systematic effort, the Near Earth Asteroid Tracking (NEAT) program, to find and catalog asteroids that could pose a threat to Earth.

Mandatory Spaceguard Survey

U.S. Congress mandated NASA to discover 90% of near-Earth objects larger than 140 meters in diameter, enhancing global awareness on asteroid threats.

Asteroid Day Proclamation

Famed astrophysicist Dr. Brian May, along with other distinguished individuals, officially proclaimed June 30 as International Asteroid Day, aimed to raise public knowledge and awareness of asteroids.

GET INVOLVED

How to Celebrate International Asteroid Day

EDITOR'S PICK

Observe Asteroids

Take some time to observe asteroids in the sky. Look for bright stars and then look for small specks of light that move against the starry background, as these are asteroids.

MAKE

Make an Asteroid Model

Gather some craft materials like clay, paint, and glitter and make an asteroid model. You can use your imagination to create a realistic looking asteroid or a colorful masterpiece.

WATCH

Watch an Asteroid Movie

Take some time to watch a movie about asteroids. There are plenty of movies out there that feature asteroids as a main part of the plot.

READ

Read About Asteroids

Visit the library or your favorite online bookstore and pick up a book about asteroids. Learn more about their characteristics and behavior.

ATTEND

Attend an Asteroid Lecture

Look for local lectures or events focused on asteroids, or even better, take an astronomy course that focuses on asteroids and the solar system.

WHY THIS DAY MATTERS

Why We Love International Asteroid Day

It promotes education

International Asteroid Day provides an excellent opportunity for schools and universities all over the world to learn about asteroids, their impact on Earth’s environment, and ways to spot and track them. We can use this knowledge to prepare for any potential impacts in the future!

It raises awareness of asteroids

International Asteroid Day is a chance to bring the threat of asteroids to the forefront of people’s minds and educate them about these potentially devastating rocks. By raising public awareness, we can better protect our planet from being impacted by an asteroid collision in the future!

It encourages exploration

International Asteroid Day celebrates humanity’s ability to explore and learn more about the universe around us. We have made great advancements in space travel, allowing us to delve deeper into the mysteries of outer space than ever before!

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