Has the solar system ever had an alien civilization?

One of the open questions about cosmic biology is whether there is life somewhere in the Solar System?

Two American astrophysicists, Avi Loeb at Harvard University and Jason Wright at Pennsylvania State University, both sought to answer this question.

Loeb said that technology artifacts from civilizations from outside the Solar System could exist somewhere on the Moon enough to say 'we exist'.

Mr. Wright, a member of the Center for Exoplanets and the World of Life, conducted research and identified a species of technological level that existed in the Solar System before humans appeared. on the earth. 

Technological artifacts from civilizations from outside the Solar System could have existed for a long time on the Moon.

In 2016, he gathered and presented his research about the origin and location of the 'signaling techniques' of such a civilization, while other astronomers sought light from the Kuiper belt objects ' could be a beacon to indicate the existence of extraterrestrial technologies , or even extraterrestrial civilizations. "

The origin and location of the signaling techniques of a technologically competent creature may have appeared on Earth itself or on another planet, like on Venus before it was a planet. greenhouse gases like today or on Mars when it still has water.

In the case of Venus, the appearance of greenhouse gases and surface transformations may have erased all evidence of the existence of that civilization on the planet's surface. In the case of the Earth, erosion and subsequent stratification may also have erased most of the evidence if that species had lived 1 billion years ago.

The remaining indigenous signaling techniques may be extremely old, making it difficult to find their existence if they are left beneath the surface layers of Mars and the Moon. or somewhere else in the Solar System.

Mr. Wright asserts that: 'The most obvious answer is the geological event that the legend called the Great Flood, even though it was a natural event, as a meteorite impact at the level. destruction, or event itself as a global climate disaster. "

In the event that it was an alien species traveling from outer space to settling in the Solar System, that event would only permanently eradicate this creature if there were many disasters throughout the Solar System. out continuously at the same time (a series of comets or interplanetary warfare), or if that settlement was not sufficient for this creature.

Another possibility is that there has been a gamma-ray or supernova explosion that caused a disaster throughout the Solar System.

From a purely scientific standpoint, Wright argues that it is a perfectly reasonable question to ask whether life may or may not have existed elsewhere in the Solar System.

In a 2019 science paper, astrophysicist Loeb and his colleagues answered this question with certainty, 'yes' . The authors mention that searching for the surface of the moon by interstellar objects over time may have brought here sprouts from other life environments in the universe. 

In his essay 'The Moon is a net for catching extraterrestrial life,' he wrote: 'The fact that the Moon has no atmosphere ensures that these informants reach the surface of the Moon without being burnt.

Besides, the Moon does not have any geological activity proving that the evidence on the surface will be preserved without being mixed with the underlying material. Like a natural mailbox, the Moon's surface collects all the falling objects from the past few billion years. Most of these 'letters' come from within the Solar System.'

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