How many advanced civilizations in our galaxy

The researchers assume that Earth is not special — if an Earth-like planet forms in an Earth-like orbit around a Sun-like star, hosting a civilization that develops technologically in a similar way to humans, there would be approximately 36 Earth-like civilizations in our galaxy. In this case, other technological civilizations would be sending out signals, such as radio transmissions from satellites and televisions, on a similar timeline as humans, also attempting to find other lifeforms.

Previous calculations of alien life have been based on the Drake equation , which includes seven factors needed to find the number of intelligent civilizations, written by astronomer and astrophysicist Frank Drake in The estimates have been extremely broad, ranging from zero to a few billion civilizations.

The team of researchers in Nottingham refined the equation using new data and assumptions. They found that there are likely between four and civilizations capable of communicating with others, with 36 the most likely number. Finding these civilizations is another issue entirely — scientists said they would be thousands of light years away. The number of civilizations depends strongly on how long they are actively sending out signals of their existence into space—such as radio transmissions from satellites and TV.

The calculation—which says that there could be 36 active communicating intelligent civilizations in our home galaxy on 4. It takes into account:. It could be that many, many more alien civilizations exist. It could also be that none exist. However, the authors note that the average distance to one of these 36 civilizations is around 17, light-years, so detection and communication is currently impossible. This is a BETA experience. You may opt-out by clicking here. More From Forbes. Animals This frog mysteriously re-evolved a full set of teeth.

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