First, it is dark, meaning that it is not in the form of stars and planets that we see. Observations show that there is far too little visible matter in the Universe to make up the 27% required by the observations. Second, it is not in the form of dark clouds of normal matter, matter made up of particles called baryons.
Livestock[edit] The raising of livestock, sheep (the traditional mainstay for generations of Icelandic farmers) and cattle (the latter grew rapidly in the 20th century), is the main occupation, but pigs and poultry are also reared; Iceland is self-sufficient in the production of meat, dairy products and eggs.
For the steakhouse, see Black Angus Steakhouse. Angus cattle, known as Aberdeen Angus in most parts of the world, are a breed of cattle commonly used in beef production. They were developed from cattle native to the counties of Aberdeenshire and Angus in Scotland. Angus cattle are naturally polled and solid black or red although the udder may be white. The native colour is black, but more recently red colours have emerged.