if dark matter is 80% of the stuff around us how don’t we know what it is.

Question: if dark matter is 80% of the stuff around us how don't we know what it is.
- Keywords:
  dark matter,
  space
Asked by (͡° ͜ʖ ͡°)JellyMan! to David, Eva, Kate, Nicholas, Rachel on 15 Nov 2015.
- Nicholas Pearce answered on 15 Nov 2015:
  
  Hey,
  
  It’s an interesting question – if there’s so much dark matter how don’t we know more about it? The main reason for this is because we can’t see it, that’s why we call it dark matter.
  We know it’s there thanks to gravity: we know how much gravity there needs to be for everything in the galaxy to be held together, and we know how much comes from the things we can see. There isn’t enough gravity from the things we can see, so we know there is more – dark matter!
  Right know we have good ideas about what Dark Matter isn’t made of, any only a few ideas of what it is.
  These videos might explain a bit more if you like:

Question: if dark matter is 80% of the stuff around us how don't we know what it is.