Ancient Planet Discovered In Milky Way Possibly Hint For "Ancient Life"

Astronomy Science ~ In the hunt for life elsewhere in the universe, one of the key questions is how and when the other planets are formed. ...

Astronomy Science ~ In the hunt for life elsewhere in the universe, one of the key questions is how and when the other planets are formed. Now astronomers may have the answer because they have found very old planet in the Milky Way, 11.2 billion years old - more than twice the age of our solar system.

More importantly, this planet is Earth-sized world, suggests that planets like our Earth has long been established in the history of the universe.

This system discovery by Dr Tiago Campante, an astronomer at the University of Birmingham is currently studying a star. The star called KOI-3158 (KOI stands for "Kepler Object of Interest '), which has been discovered by the Kepler Space Telescope and is 117 light-years away in the Lyra constellation.

There are about five planets orbiting this star, all smaller than Earth. And they were able to estimate that the system is 11.2 billion years old. By comparison, our sun 4.56 billion years old.

Comparison of planets in the solar system KOI-3158
According Campante, the fifth planet is a multiplanet system nearest and brightest ever detected by space telescopes. "It shows that Earth-sized planets may be easily formed in the early history of the universe,"  He said, KOI-3158 is formed when the universe was less than 20 percent of its current age. "So, this shows that Earth-sized planet formed in most of the universe's history, opening the possibility for the existence of ancient life in the galaxy," he explained.

The innermost planet in the system is about the size of Mercury, the middle third planet about the size of Mars, and the outermost planet slightly smaller than Venus. However, life may not occur in this system - all of them orbits very close to their parent star, much closer than Mercury's orbit in our own solar system.

Although KOI-3158 25 percent smaller and 700 degrees cooler than the sun, the distance is considered too small, and the temperature is too hot for life to survive. But the age and size of the planet is what makes this system attractive solar system and we have to think that an Earth-sized planet in the habitable orbit may have formed elsewhere in the universe.

Life on Earth is estimated to take billions of years to reach anything like today, leading some to believe we might be one of the first planets in our galaxy that have formed a complex life.

But, if other planets had been more than twice than the age of the Earth, life might begin elsewhere. Other scientists have suggested that the lack of life found elsewhere might be due to complex life becomes very scarce.

The discovery of this ancient planet brings us one step closer to finding out whether we are alone in the universe or not.
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Astronomy Science: Ancient Planet Discovered In Milky Way Possibly Hint For "Ancient Life"
Ancient Planet Discovered In Milky Way Possibly Hint For "Ancient Life"
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Astronomy Science
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