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Originally Posted by The Fonz
The more I think about it the more I don't believe it's possible they were detecting any object "3-12m in diameter and reaching speeds of 15km/s".
It's more likely that humans would project an image which would appear to be moving at that speed from our perspective, than to actually build that object. I don't believe it's remotely possible for humanity to propel an object at 50,000+ km/h through the troposphere.
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Based on the technology we have available to us, unlikely. The concept of gravimetric drives would theoretically make it possible, but the jet and propellant engines we are familiar with makes it almost impossible. The friction and heat from the atmosphere would make it impossible IMO. Those speeds can only be attained where the atmosphere is non-existent and won't work to slow the craft down. You would need to eliminate the effects of the atmosphere by creating a field around the craft and bending it through space. Again, all theoretical, but supposedly that's how these things would be possible.