The O stars is the most luminous, then B, then A, F, G, K, and M stars are the least luminous_____ there must be a relationship between mass and luminosity.
Because circumpolar constellations never rise or set, they provide reliable reference points for astronavigation. Knowing the circumpolar constellations in each hemisphere allows navigators to find their way using only the stars.
The cordillera de los andes
A trade barrier is something that stops countries from freely trading with each other (this can be as a result of conflict)
For example, In China and India, through wars, a gradual trade barrier has been created due to the fact that the countries are going through warfare tension
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