Why do Christians believe in the Resurrection of Jesus but not alien abductions?

[Wyrd of Gawd]

Do you have a clue how far the nearest solar system is that might have intelligent life capable of building interstellar space ships?  None of them would try to reach us because it takes too long and takes too much coal.  Besides, the spaceship would have to be perfect in all aspects.   Based on human history the civilization that launched such a space ship would have died out by the time it reached Earth and their world would be completely different by the time it returned to it.

I agree that interstellar space travel is not without its difficulties; clearly, any advance civilization undertaking such a venture would need to have developed some sort of controlled nuclear fusion, but if such a technology exists, then, yes, interstellar space travel would be possible.  And, also, you have to consider the effects of special relativity; if a space-faring civilization could reach speeds that are near the speed of light, time dilation would set in, and then, some sort of micro-regenerative cryogenics may be possible using some sort of nano-technology.  Who knows?!  Can you imagine a world without smartphones?

So there you are whizzing through space at light speed or greater.  Would your mass increase?  Would you affect space junk with your gravity field?  How would you avoid smashing into space junk?  How wealthy would your home world have to be in order to build and sustain a space-faring civilization?  And what would be its purpose?