Asteroid

https://www.youtube.com/watch?v=VGosZWBTF7A        

Minerals like iron, gold, copper are the ____________________ of the world’s economy, from the Arctic circle to the Sahara desert. But mining comes with a critical environmental cost, which may require us to think about ____________________ before it is too late. Asteroids, moons and planets in the solar system hold limitless sypply of __________________. Gold, platinum and rare earth metals make asteroids very high priced. Mining in space needs advanced technologies to realize business and ____________________. Such may help humans to expand operations off the Earth. During the past 20 years, government and ____________________ companies have been investigating asteriods’ composition, location and possible pay offs to mine them. Only at one time in history could human bring asteroid sample to the Earth. But even then, the sample was merely ____________________. Compared to the moon, there is very little gravity. So you have to attach yourself to the asteroid whereas on the Moon, the gravity will hold your ____________________ in place. It only makes sense if the materials brought from space to Earth are valuable. But if it does, returning could __________________ those materials.

KEY 1. 2. 3. 4. 5. 6. 7. 8.

Lifeblood Off-planet solutions Untapped resources Economic opportunities Private aerospace Dust particles Processing equipment Drastically devalue