987 Nickel, iron, cobalt 0.
Some astrophysicists have suggested that if advanced extraterrestrial civilizations employed asteroid mining long ago, the hallmarks of these activities might be detectable.
According to one of the scientists, "The lines are becoming more and more blurred between comets and asteroids.
No new asteroids were discovered until 1845.
๋ค์ ๋ถ์ ๋ฌธ์์ ์ซ์๋ ํด๋น๋๋ ๋ณด๋ฆ์ ๊ธฐ๊ฐ ์์์ ๊ทธ ์ํ์ฑ์ด ๋ฐ๊ฒฌ๋ ์์๋ฅผ ๋ํ๋ธ๋ค.
Retrieved 2 March 2007.