Ever wondered what will be the size of the impact crater when an asteroid or a comet hits the Earth? With Impact Calculator you can find it out. Choose the size of the projectile, angle of impact and velocity. Select the material of the projectile. Porous rock and dense rock will simulate an asteroid while ice will be more or less like a comet. Though an option for combining various materials would have probably given better results. You can also select where you want the object to crash - in water, in sedimentary rock which is widely found on Earth's surface, or in igneous rock which occurs beneath the Earth's surface. Select the observer's location a few kilometers away from the impact area to get a damage report.

After you submit your data you will get a detailed information of what will happen if such an event were to actually occur. Some of the information that includes are

• size of crater (width and depth)
• magnitude of the earthquake produced
• decibel level of the explosion
• height at which the object breaks up while entering the Earth's atmosphere
• size of the fireball produced
• amount of heat and kinetic energy released
• extent of damage at the location of the observer
• how frequently such an incident actually occurs on earth

This is how big the crater will be when an asteroid 1Km across traveling at 16Km/s collides with Earth at 65 degree angle. Standing in the middle is the Eiffel Tower.