It is triple the age of Earth, and is thought to be just a billion years younger than the universe itself, when traditionally, it is believed that planets cannot be as old as the universe, because, 13.8 billion years ago, at the time of the big bang, the materials required for a planet to form were not there in the universe, then. PSR 1620-26 b is probably the oldest planet of the universe, old enough to defy the traditional astrophysical models. The conditions lead to rock rain: vaporized rocks that fall as liquid rock rain, and solidify on the surface of the planet. Since it is tidally locked, it always faces its star on one side where temperature is can be 4000☏, while the temperature on the side facing away is as about 350☏. It is believed to have been a giant gas planet initially, like Neptune or Saturn, but due to its proximity to its host, it gradually lost its gas and atmosphere layers. The CoRoT-7b is a strange and mysterious planet outside the solar system, and the first rocky planet discovered orbiting a star other than the Sun. Surprised scientists classify it in a whole new planet classification called chthonian. This gas planet, under the extreme heat, and immense pressure, has faced evaporation of different atmospheric gases that stream escape its gravitational field, including hydrogen, carbon and oxygen. Naturally, its temperature is extremely high: about 1832☏. It is 30% larger than Jupiter, while its orbit is 1/8th of Mercury distance from Sun. HD 209458 b, located 150 light years away from planet Earth, in the Pegasus constellation, and is the first exoplanet to be discovered in transit of its orbiting star. The 10 Strange and Mysterious Planets in The Known Universe. The 10 Strange and Mysterious Planets in The Known Universe.
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