Dark matter is observed by the gravitational effect that  it has on radiation and the visible universe. The gravitational  force it has from dark matter plays a critical role in the shape of  the galaxies orbit and the because of the hot gases in the groups  of galaxies.
The Angus breed is perhaps the most used, most well-known breed of beef cattle in the U.S. With origins in northeast Scotland, Angus, also known as Black Angus, is popular among Brits and Americans and was first imported to the United States in 1873.
Beef is so popular that July has even been named Beef Month. Sink your teeth into more facts about beef. 1  Texas is the top producer of beef in the U.S., followed by Nebraska, Missouri, Oklahoma and South Dakota. 2  Cattle are ruminants, which means they have four chambers in their stomach. There are 50 breeds of beef cattle in the U.S. The most popular are Hereford, Angus, Brahman and Charolais. 2  The basic cuts of beef are the chuck, loin, rib and round. 3  Names for the cuts of meat can vary from region to region.