Defend Earth against 6 potentially hazardous asteroids.

"Asteroids Defense" is a free online knowledge level game to defend planet Earth from falling asteroids. Minute to win it game. Astronomy learning game, suitable for online classes and interactive lessons. Fun astronomy educational game to explore and study Earth-crossing potentially hazardous objects. Part of the Interactive Astronomical Observatory educational tools.

There are 6 Earth defense rockets at the bottom of the screen. Press keyboard key "1" to launch rocket 1, key "2" for rocket 2, key 3 for rocket 3 and so on. From the top of the screen random generated hazardous asteroids will begin to fall toward Earth's atmosphere. Hit and destroy them with the rockets before they reach the Planet. Destroy 84 asteroids to win the game.

A potentially hazardous object is a near-Earth object, either an asteroid or a comet, with an orbit that can make exceptionally close approaches to the Earth and large enough to cause significant regional damage in the event of impact. As of 2018 there are 1 885 known potentially hazardous object, of which 157 are estimated to be larger than one kilometer in diameter. Here are 6 popular hazardous asteroids:

1. 1685 Toro is an eccentric stony asteroid and near-Earth object of the Apollo group, approximately 4 kilometers in diameter.

2. 1862 Apollo is a stony asteroid, approximately 1.5 kilometers in diameter, classified as a near-Earth object (NEO). 1862 Apollo is a potentially hazardous asteroid (PHA) because its minimum orbit intersection distance (MOID) is less than 0.05 AU and its diameter is greater than 150 meters.

3. 1620 Geographos is a highly elongated, stony asteroid, near-Earth object and potentially hazardous asteroid of the Apollo group, with a mean-diameter of approximately 2.5 kilometers.

4. 1864 Daedalus is a stony asteroid and near-Earth object of the Apollo group, approximately 3 kilometers in diameter.

5. 1566 Icarus is an extremely eccentric asteroid, approximately 1.4 kilometers in diameter. It is a near-Earth object of the Apollo group and the lowest numbered potentially hazardous asteroid.

6. 1981 Midas is a vestoid asteroid, classified as a near-Earth object and potentially hazardous asteroid, approximately 2 kilometers in diameter.