The funnellike shape of Lake Cheko, in contrast, resembles those of known impact craters of similar size — for instance, the so - called Odessa crater, which was created 25,000 years ago by the impact
of a small asteroid in what is now Odessa, Tex..
The destruction was the
result of a small asteroid that entered Earth's atmosphere over the Russia / Kazakhstan border, about 60 miles south of the city.
Researchers now report that they can use this gamma ray radiation to infer the
number of small asteroids in different groups of small solar system bodies.