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.
Cattle âcolloquially cows âare the most common type of large domesticated ungulates. They are a prominent modern member of the subfamily Bovinae, are the most widespread species of the genus Bos, and are most commonly classified collectively as Bos taurus.attle were originally identified as three separate species: Bos taurus, the European or taurine cattle (including similar types from Africa and Asia); Bos indicus, the zebu; and the extinct Bos primigenius, the aurochs.