Thread: Apophis - The Earth's forseeable threat.

Originally Posted by TheOriginalGrumpySpy

The year: 2029

The size estimation: 270 meters

If this asteroid passes through what is considered a gravitational keyhole then in the year 2036 an impact with Earth is on the odds of 1 in 45,000.

In this thread you consider what to do to a) deflect said asteroid or b)prepare for impact.

Is 2029 the year when the asteroid may or may not pass through this gravitational keyhole?

Also, what kind of impact would an asteroid of 270 meters create? I NEED TO KNOW.

Originally Posted by KT.

Also, what kind of impact would an asteroid of 270 meters create? I NEED TO KNOW.

Assuming an impact velocity of ~12 km/s (pretty typical), you'd get a ~500 megaton blast (equivalent to 500 million tons of TNT, or 25,000 Hiroshima bombs) and a crater several miles across (assuming a land impact). For reference, a 200 megaton explosion (Krakatoa eruption in 1883) messed up the global climate for several years.