How would an alien spot life on Earth?

The Earth seen from the Moon. (Getty)

The image of the Earth from outer space identifies us

When the Galileo spacecraft flew over the Earth in 1990, the astronomer Carl Sagan had a great idea: to pretend to be an alien aboard his ship and find out how he could check if there is life on our planet.

From space, the alien ship would probably detect modulated radio waves: an important clue that would confirm the aliens’ suspicions that there is in fact life on the Blue Planet.

But, undoubtedly, the geometry of our cities and fields would be a clear sign of the existence of “intelligent life”.

A tiny Blue Dot

Carl Sagan was part of the Vogayer 1 image team, a spacecraft sent to study the Solar System.

Taking advantage of the ship’s voyage across the universe, Sagan decided to photograph the planets from outer space. It was the first time for Neptune, Uranus, Saturn, Jupiter, Earth and Venus to be seen in the same photograph.

The photograph of the Earth was taken at a distance of 6,000 million km. From that moment, our planet is also known as a pale blue dot.

That same picture lead to the first famous reflections ever on humanity and our insignificant role in the vast universe.

Translated by Chaplin’s Languages | Find out more in Junior Report

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