Dark Matter
I haven't done much research on dark matter but I recently read an article that said that WIMPS (Weakly Interactive Massive Particles) haven't been found so now they are looking for more exotic forms of matter. The article (http://www.dailymail.co.uk/sciencetech/article-3586781/Is-dark-matter-changing-stripes-Mysterious-invisible-material-slowed-expansion-universe.html) talks about Bose Einstein Condensates. The word stiff is also used and that's what I've been saying. They are extremely stiff shapes that are extremely strong and extremely light. Perhaps a Bose Einstein Condensate being would be almost invisible yet extremely strong. Another possibility is that they are like protons or some other particle blown up like a balloon into whatever shape they might need in the same way a computer generated creature is a hollow outer shell with nothing inside. They say that if we do encounter life it will be something we can't imagine and unlike