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.
Angus, and more specifically Black Angus, is the most prevalent beef-producing breed in the U.S., with numbers greater than the next seven breeds combined. Some of this is the result of history â Scottish Angus stock was the first cross-bred with the exclusively longhorn herds brought over by the Spanish.