QUOTE (perkins @ Jul 3 2008, 05:54 PM)

Well im new to this forum but i was just thinking if there are craft from other planets travelling light years to our planet then how could they travel at such high speeds in space and not hit rocks and debris that is floating in space? If a small rock hit a craft that was going very fast wouldnt that go right through it like a bullet?
Also i just wanted to say that i have a video i made when i was around 16 or 17 (im 29 now) of some sort of craft behind my house going at a slow speed and with spinning lights around it, you can see how slow it is going becasue it is flying really low and you can see it moving past the trees. there was another witness and he amazed he is like 45 years old and you can hear him on the tape. I have to somehow get it from a vhs tape to my computer.
Yes you are absolutely right, but an impact with a craft travelling at a considerable percentage of the speed of light, even if the object colliding was tiny, like a grain of sand or even smaller would be catastrophic. You just need to look at the research into railgun technology, where an object launched and propelled at incredible speeds has a similar impact to that of a cruise missile.
There are so many complications with the prospect of interstellar travel, and this is the main reason I am skeptical. But as some people propose there are other methods, in theory, like warp or dimensional travel etc. I believe this would be the only real way we could be seeing ET life, however, I refuse to really speculate further as their is simply not enough known about such theories, and I don't mean my own knowledge, but universally, it is fringe physics and only just developing into common researchable concepts. Very exciting stuff though!