Here is a possible concise summary:
The video is about the threat of asteroids hitting the earth and why it is hard to detect and deflect them. It explains how asteroids are formed, how they have impacted the earth in the past, and what are the chances and consequences of a future impact. It also discusses some of the ideas and challenges for preventing an asteroid collision. It ends with a promotion for KiwiCo, a company that makes educational projects and toys for kids.
Here are the key facts extracted from the text:
1. An asteroid heavier than the Eiffel tower slammed into the atmosphere over Chelyabinsk Russia on February 15th, 2013 and exploded 30 kilometers above the ground.
2. The explosion was brighter than the sun and caused a shockwave that damaged thousands of buildings and injured 1500 people.
3. Scientists had predicted that another asteroid, known as Duende, would make a close fly-by of earth on the same day, but they completely missed the Chelyabinsk asteroid.
4. Since 1988, over 1200 asteroids bigger than a meter have collided with the earth, and only five of them were detected before they hit.
5. Asteroids are the leftover debris from when our solar system formed four and a half billion years ago, and some of them are rocky while others are mostly metal.
6. Most of the asteroids have stable orbits between Mars and Jupiter, in the main asteroid belt, but some have made their way closer to earth and are known as near earth objects.
7. Stephen Hawking considered an asteroid impact to be the greatest threat to life on earth, but finding asteroids is difficult for several reasons, such as their small size, dark color, and unpredictable orbits.
8. Barringer crater in Arizona was formed by a 50 meter asteroid impact 50,000 years ago that released the energy equivalent of 10 megatons of TNT.
9. The dinosaurs were wiped out by a 10 kilometer size asteroid that hit about 65 million years ago and caused global effects such as heating up the sky, launching debris into suborbital trajectory, and triggering massive fires.
10. There are no 10 kilometer impacters with a path that intersects the earth for the next hundred years, but there are many smaller asteroids that could still cause significant damage if they hit.
11. We do not have a way to deflect a kilometer size asteroid or larger at the moment, and even evacuating a city in case of an impact is very difficult due to logistical challenges.
12. The best thing we can do is to look for them and build telescopes to detect them before they strike.
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