From the ‘X Files’: ET’s May Have Left Message Code in Human DNA

Lores

There's also a chance that past visits to Earth by intelligent aliens left signs much closer to home. But probability and the length of the universe's age suggest that any such alien visit would have taken place before humans ever emerged on Earth, says Paul Davies, astrophysicist with Arizona State University.

That means any traces of an alien visitation would have had to survive for hundreds of millions or billions of years of erosion and plate tectonics for humans to still find them today.

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Weekend Feature: Planet-Killing Supermassive Black Holes the Cause of Mysterious Zodiacal Dust

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Vast clumps dust shrouds that obscure about half of supermassive black holes could be the result of high speed roller-derby crashes between planets and asteroids, according to a new theory from an international team of astronomers, led by Sergei Nayakshin of the University of Leicester. Collisions between these rocky objects would occur at colossal speeds as large as 1000 km per second, continuously shattering and fragmenting the objects, until eventually they end up as microscopic dust.

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Weekend Feature: The Early Milky Way “Death Beamed” its Smaller Satellite Galaxies

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The existence of a new signature of the birth of the first stars in our galaxy, the Milky Way was revealed by two researchers from Observatoire Astronomique de Strasbourg. More than 12 billion years ago, the intense ultraviolet light from these stars dispersed the gas of our Galaxy's nearest companions, virtually putting a halt to their ability to form stars and consigning them to a dim future.

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Weekend Feature: “Cosmic Life Engines” –Organic Building Blocks Confirmed in Intersellar Dust

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New discoveries in vast interstellar dust clouds permeating the universe and in nebula have revealed hints of organic matter that could be created naturally by stars, according to researchers at the University of Hong Kong. The discovery team  observed stars at different evolutionary phases and found that they are able to produce complex organic compounds and eject them into space, filling the voids between stars.

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Massive Dying Star Orbited by a Jupiter-Like Planet and Mystery Object –Discovered Outside Our Solar System

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Three planets — each orbiting its own giant, dying star — have been discovered by an international research team  The new research is expected to shed light on the evolution of planetary systems around dying stars. It also will help astronomers to understand how metal content influences the behavior of dying stars.

The three newly-discovered planetary systems are more evolved than our own solar system. "Each of the three stars is swelling and has already become a red giant — a dying star that soon will gobble up any planet that happens to be orbiting too close to it," according to Alex Wolszczan, professor of  astronomy and astrophysics at Penn State, who, in 1992, became the first astronomer ever to discover planets outside our solar system.

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