Interactive · Game
Asteroid Defender
One ship, ten waves, and a sky full of real asteroids. Fly on your phone or your computer, survive every wave, and learn one true thing about each rock you just dodged. No accounts, no scores stored anywhere: your best lives only in your browser.
Defend Earth
Ten waves of real asteroids stand between you and a quiet sky. Drag to fly on your phone, or use WASD or arrow keys on a computer. Your ship fires on its own, so your only job is to not get hit.
No account. Your best score lives only in this browser.
Phone: drag to move. Computer: WASD or arrow keys to move, P to pause. Your ship fires automatically.
Want more ways to play with the universe? See all interactives from quizzes to sky swappers.
The honest questions
Is Asteroid Defender free?
Yes, completely. No account, no signup, no cost. Just press start and fly.
Are my scores stored anywhere?
No. Your best score lives only in this browser, and your share link carries your score inside the link itself. Nothing is saved on our servers.
Can I play on my phone?
Yes. The game is built phone first: drag to move, and your ship fires on its own. On a computer, use WASD or arrow keys, or steer with the mouse.
Are the asteroids real?
Yes. Each wave is named after a real asteroid: Bennu, Ryugu, Itokawa, Didymos, Eros, Apophis, Toutatis, Vesta, and Psyche, plus a final planet-killer class rock. A true fact about each one appears after you clear its wave.
How do I share my score?
The game over screen gives you a link with your score baked in. Anyone opening it sees your score and can try to beat it.