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.
1 Angus, which are medium-sized black, polled cattle, originating from Angus in Scotland. 2  Angus cattle are known for excellent quality beef, and ability to be used in cross-breeding, such as crossing Angus onto Hereford cows or heifers to get black-baldies.3  Angus is the most popular beef breed in the United States.ypes of cattle that are used for beef: 1  Angus, which are medium-sized black, polled cattle, originating from Angus in Scotland. 2  Angus cattle are known for excellent quality beef, and ability to be used in cross-breeding, such as crossing Angus onto Hereford cows or heifers to get black-baldies.