Answer:
Explanation:
a system of two stars that are gravitationally bound to and in orbit around each other
Binary stars are two stars orbiting a common centre of mass. The brighter star is officially classified as the primary star, while the dimmer of the two is the secondary (classified as A and B respectively). In cases where the stars are of equal brightness, the designation given by the discoverer is respected.
Binary pairs can be classified based on their orbit. Wide binaries are stars that have orbits that keep them spread apart from one another. These stars evolve separately, with very little impact from their companions. They may have once contained a third star, which booted the distant companion outward while eventually having been ejected themselves. Close binaries, on the other hand, evolve nearby, able to transfer their mass from one to the other. The primaries of some close binaries consume the material from their companion, sometimes exerting a gravitational force strong enough to pull the smaller star in completely. The pairs can also be classified based on how they are observed, a system that has overlapping categories. Visual binaries are two stars with a wide enough separation that both can be viewed through a telescope or even with a pair of binoculars. Five to 10 percent of visible stars are visual binaries. Spectroscopic binaries appear close even when viewed through a telescope. Scientists must measure the wavelengths of the light the stars emit and determine their binary nature based on features of those measurements.
Eclipsing binaries are two stars whose orbits are at an angle so that, from Earth, one passes in front of the other, causing an eclipse. This feature is based on the line of sight rather than any particular feature of the pair.
Astrometric binaries are stars that seem to dance around an empty space; that is, their companions cannot be identified but only inferred. Such a companion may be too dim to be seen, or could be hidden in the glare from the primary star.
Stars referred to as double stars are two that appear close together in the sky visually, but are not necessarily anywhere near one another in space.
Answer:
The Alarm Stage.
Explanation:
General Adaptation Syndrome is the different stages of stress developed by Hans Selye, a researcher.
The stages of stress, according to GAS are:
In the Alarm Stage of GAS, when faced with stressful situations, the body reacts as in "fight-or-flight" response. In this stage, an alarm signal is sent to the body by the brain, giving them warning of the dangerous situation. In this stage, a person facing a dangerous situation, while having faster heart-beat rate. This leads to a reduction in immune system functioning.
The immediate result of the Protestant Reformation was the split of Christianity into Protestants and Catholics, leading to social and political changes across Europe.
An immediate result of the Protestant Reformation was the split of Christianity into Protestants and Catholics.
Before the Reformation, there was only one Christian church, which was the Catholic Church. However, the Reformation led to the emergence of new Protestant denominations, such as Lutheranism and Calvinism.
This religious division led to social and political changes across Europe, including the Thirty Years' War and the eventual establishment of religious freedom.
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Answer:
The Secretary of State
Explanation:
The Secretary of State of the United States is the title of the head of the United States Department of State, which deals with foreign affairs. According to the Constitution of the United States, the Secretary performs functions such as the President demands. This includes negotiations with foreign representatives and instruction from the US embassy or consulates abroad.