Alpha Centauri passes five tests which is conducted on extra-terrestrial life.
<h2>Explanation:</h2>
Alpha Centauri is a three-star system in the Milky Way which is closer to the sun and could possibly provide extra-terrestrial life. The three stars are Alpha Centauri A, Alpha Centauri B, and finally the Proxima Centauri. For a planet to be listed as habitable like earth it must pass five conditions.
A closer look at the three stars separately shows that Alpha Centauri A passes all the conditions, while Alpha Centauri B passes only 4 and fail to meet one criterion. However, Proxima Centauri is excluded since it doesn't qualify.
A unitary system is a centralized form of system and we're all powers that are held by the same government and consist of a single agency like great Britain.
In a federal system, the powers are divided between the center and the local government. like the U.S Canada, Switzerland and India.
A confederation is an alliance of independent states or nations. Like the European Union.
