25
days
3
weeks
600
hours
25
sleeps
About Asteroid Day
Asteroid Day is a United Nations-sanctioned global awareness campaign held every year on June 30th, marking the anniversary of the 1908 Tunguska event — the largest asteroid impact in recorded history, which flattened 2,200 square kilometres of Siberian forest. Co-founded in 2014 by Stephen Hawking, astronaut Rusty Schweickart, Queen guitarist and astrophysicist Brian May, and others, it brings together scientists, educators, and citizens to highlight the importance of planetary defence. Count down the days until Asteroid Day with our live countdown timer.
When is Asteroid Day in other years?
The following is a list of dates of when Asteroid Day will happen in the future.
Future Asteroid Day dates
| Event | Date | Link |
|---|---|---|
| Asteroid Day | Countdown | |
| Asteroid Day | Countdown | |
| Asteroid Day | Countdown | |
| Asteroid Day | Countdown | |
| Asteroid Day | Countdown |