Answer:
Rank of the stars from shortest to longest distances:
Barnard's Star (M4)
61 Cygnia A (K5)
Alpha Centauri A (G2)
Sirius (A1)
Spica (B1)
Explanation:
The habitable zone, also known as the circumstellar habitable zone, is the range of distances from a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planets.
The location of a star’s habitable zone is dependent upon its luminosity, which is the amount of light emitted by an object in a unit of time, because a star’s luminosity increases with time; and also the star's mass.
The inverse square law of light brightness can be used to determine the extent of the habitable zones for different luminosity stars with the formula:
star boundary = Sun boundary × squareroot[(star luminosity)/(Sun luminosity].
Answer:Haiti’s location relative to the tectonic plates, the low level of development of Haiti, the time of day the earthquake hit, and the history that lead up to the current state of Haiti.
Explanation:
A theory is a system of rules and principles that can be applied to a wide variety of circumstances and has been successfully tested, but that is not universally accepted.
The intent of THEORY is a reasonable or scientifically satisfactory known principle or body of principles proposed to explain phenomena. The word often denotes an untested hunch or a guess without backing proof. But for scientists, a theory has closely the opposite meaning. A theory is a well-substantiated description of a facet of the real world that can incorporate rules, hypotheses, and facts.
The theory is a belief to clarify something, or a set of directing principles. Einstein's views about relativity are an example of the theory of relativity.
More about theory:
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People are killed
Shops are damaged
Landscape is destroyed.
The correct answer is letter D. Economy. Perestroika, as announced early in his years of leadership, was Gorbachev's policy to restructure the economy. At that moment, it's one of the crucial things to be taken care of.
