water and i thought this was a much more interesting pay load than water. >> and lastly, space is very large, endless area there, but all of space junk, does it create a problem at all? is there a limit to how much we should put out there and up there are? >> is there any interest in cleaning it up or just because it's space you just leave it? >> well, in lower earth orbit there's enough atmosphere up there, enough air molecules that it will slow things down and they will eventually come down and so, yeah, we keep putting up more spacecraft and pieces up there but they are coming down. it is a problem and it's a growing problem because ear launching more and more satellites. the push now is to these nano sats that are going to go up big constellations in lower orbit. we're adding a lot more stuff in the coming years and it is a concern. there's no question about it. >> all right. word for the day, spacecraft. it's hyphenated.
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