Aliens trying to send probes to Earth will have two massive obstacles to overcome, experts have warned.
In much the way humans have been searching for aliens for decades, it's possible that our extraterrestrial counterparts are doing the same – should they exist. But, according to a leading expert, there are two main issues aliens would need to crack before they're able to probe us for information.
The first is physics and the second is engineering. Keep in mind that we have no idea what alien life is like and how far, if at all, advanced they are, assistant professor of materials science and engineering at University of California, United States, Scott McCormack pondered why we haven't seen aliens yet and what their tech might look like.
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