I am a selfish person.
Simply if the whole universe started from the "Big Bang (BB)", as the creationists say, then all the beings in the universe, aliens and all, started from one point. Since then we have been drifting away from the rest at a speed, which was the same as the speed of light at the "beginning", and reduced to the speed we have now, according to the laws of physics. So for an alien to come to Earth first he/she will have to exist outside this solar system, second to contact us they will have to have evolved a hell of a lot faster, than us as this argument.
“To image Earth in a similar fashion, an alien civilization would need technology far beyond what Earthlings can even dream of,” said Sara Seager, a planetary theorist at the Massachusetts Institute of Technology and co-investigator on the extended mission. While seemingly huge, the distance to the craft during its filming was tiny in cosmic terms: less than one-hundredth the distance to the furthest planets in our own solar system, let alone others.
Yet “space telescopes under study by NASA would be able to observe an Earth twin as a single point of light—a point whose total brightness changes with time as different land masses and oceans rotate in and out of view,” Seager said. “The video will help us connect a varying point of planetary light with underlying oceans, continents, and clouds—and finding oceans on extrasolar planets means identifying potentially habitable worlds.”
“Our video shows some specific features that are important for observations of Earth-like planets orbiting other stars,” said Drake Deming of the agency’s Goddard Space Flight Center in Greenbelt, Md., deputy principal investigator for EPOXI.
“A ‘sun glint’ can be seen in the movie, caused by light reflected from Earth’s oceans, and similar glints to be observed from extrasolar planets could indicate alien oceans. Also, we used infrared light instead of the normal red light to make the color composite images, and that makes the land masses much more visible.” That happens because plants reflect more strongly in near-infrared light, a type of light with slightly less energy than the type visible to the naked eye, Deming explained.
The University of Maryland leads the overall EPOXI mission, while NASA Goddard leads the extrasolar planet observations."
From "Earth filmed as “alien” world"
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