Extraterrestrial civilizations#4

1, Scientists find a new way to find extraterrestrial civilization, the extraterrestrial city's lights may be the key.
2, Statistics show that the Milky Way may have deposit extraterrestrial civilization 900 light-years from Earth.
3, The risk of contact with aliens
4, Scientists used the Arecibo radio telescope send an "Earth Telegraph" to the Hercules Globular Cluster M13.
5, There has a plan to find Terrestrial Planet.
6, We can use Oxygen to find life.
7, Hawking believes that the view of the alien may take Earth's resources looted and then sped away, the humans take the initiative to seek contact with them "a little too risky".
8, Crop Circles
9, crop circles is Similar as the information sent in 1974.
10, More and more scientists believe that humans are not alone in the universe.