Star clusters are groups of stars which are gravitation-ally bound. Two distinct types of star cluster can be distinguished: globular clusters are tight groups of hundreds of thousands of very old stars, while open clusters generally contain less than a few hundred members, and are often very young.
Binary system: a system in which information can be expressed by combinations of the digits 0 and 1. to represent codes and data. Since zeros and ones can be easily represented by two voltages, the binary system is the foundation on which digital technology is built. Every digital computer whether a pocket calculator or a mainframe uses the same binary notation.
I know that question #4 is B.) Sun
It may be the captial because of how it is the largest city in Argentina. (2.8 million) The second largest city, Cordoba, has only 1.3 million. And also Buenos Aires is internationally known.
Answer:
12
Explanation:
Spring in the Northern Hemisphere begins March 20 or 21 when again the Earth is not tilted toward or away from the sun. There are 12 hours of daylight and 12 hours of darkness on this day.
