Researchers from Edinburgh University have said 'self replicating' robotic space probes from alien civilisations could already have arrived in our solar system according to mathematicians Duncan Forgan and Arwen Nicholson referred to in their paper 'Slingshot Dynamics for Self Replicating Probes and the Effect on Exploration Timescales', could be so hi-tech that they're invisible to human beings, the researchers said. According to the researchers' calculations alien probes would only need to travel at one tenth of the speed of light in order to explore every part of our galaxy within 10 million years.
"The fact we haven't seen probes of this type makes it difficult to believe that probe building civilisations have existed in the Milky Way in the last few million years," said Forgan. Astronomers found a surprising spiral structure by using ALMA observatory (Atacama Large Millimeter/submillimeter Array) in Chile's Atacama Desert shown in the image above. They have discovered a totally unexpected spiral in the material around the old star R Sculptoris. This is the first time that such a structure, along with an outer spherical shell, has been found around a red giant star. It is also the first time that astronomers could get full three-dimensional information about such a spiral. The strange shape was probably created by a hidden companion star orbiting the red giant.
In 2011, Jacob Haqq-Misra a research scientist with the Blue Marble Space Institute of Science suggested that alien objects could already exist in our solar system without us knowing. Haqq-Misra says that "If intelligent, technological extraterrestrial life exists in the galaxy, then it is conceivable that such a civilization might embark on an exploration strategy. Extraterrestrial intelligent (ETI) civilizations may choose to pursue astronomy and search for planets orbiting other star systems and may also choose to follow-up on some of these targets by deploying their own remote exploratory spacecraft. If nearby ETI have observed the Solar System and decided to pursue further exploration, then evidence of ETI technology may be present in the form of such exploratory probes. We refer to this ETI technology as “non-terrestrial artifacts”, in part to distinguish these plausible exploratory spacecraft from the flying saucers of science fiction.
In a recent paper titled “On the likelihood of non-terrestrial artifacts in the Solar System”, published in the journal Acta Astronautica, Haqq-Misra and co-author Ravi Kopparapu discuss the likelihood that human exploration of the Solar System would have uncovered any non-terrestrial artifacts. "Exploratory probes destined for another star system are likely to be relatively small (less than ten meters in diameter), so any non-terrestrial artifacts present in the Solar System have probably remained undetected. The surface and atmosphere of Earth are probably the most comprehensively searched volumes in the Solar System and can probably be considered absent of non-terrestrial artifacts.
"Likewise, the surface of the moon and portions of Mars have been searched at a sufficient resolution to have uncovered any non-terrestrial artifacts that could have been present. However, the deep oceans of Earth and the subsurface of the Moon are largely unexplored territory, while regions such as the asteroid belt, the Kuiper belt, and stable orbits around other Solar System planets could also contain non-terrestrial artifacts that have so far escaped human observation. Because of this plenitude of nearby unexplored territory, it would be premature to conclude that the Solar System is absent of non-terrestrial artifacts."
The Daily Galaxy via University of Edinburgh and http://haqqmisra.net/