Do you what are the arguments that support Big Bang Theory? 1- Cosmic Microwave Background radiation these were discovered and observed by Arno Penzias and Wilson. They detected microwaves coming from all directions of the earth. They perceived that these Background radiations are the left over of the original ones. 2- The light spectrum of stars and galaxies; objects moving away show red light due to red wavelengths and objects moving closer show blue light.
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So we are radioactive, good news, we are aliens! =)
Yes, we are all aliens. Aliens in infinite sense. Even social media and technology is giving birth to new aliens.
And even worse, everything indicates that we will continue to be aliens for a long time to come...