Life on MarsThe search for life on Marsand the moral issues confronting us as we prepare to send humans there. Does life exist on Mars? The question has captivated humans for centuries, but today it has taken on new urgency. As space agencies gear up to send the first manned missions to the Red Planet, we have a responsibility to think deeply about what kinds of life may already dwell thereand whether we have the right to invite ourselves in. Telling the complete