評論
打印
Conversation Two
M: Did you know that astronauts have made commercial products in space?
W:No, I wasn’t aware of that. What kind of products?
M:Tiny plastic beads.
W:Beads? Do you mean to tell me that astronauts have nothing better to do than make jewelry beads in space? It seems to me they can make more useful things out there.
M:Oh, but these plastic beads aren’t for jewelry. They can be used for many scientific purposes, from conducting cancer research to calibrating microscopes.
W:That sounds better. But why make such objects in space rather than on earth?
M:Because earth’s gravitational pull affects the beads. The beads on earth are distorted, not exactly round. The ones made in space are precise spheres.
