Answer:
The celestial sphere is a fictional sphere to which all celestial objects can be projected.
Explanation:
At any time an observer can see only the half of celestial sphere because the other half lies under the horizon. The celestial sphere is the medium used for sphere astronomy. The celestial sphere does not have a defined magnitude. It can be infinite or at least really big.
The sun always rises in the east and sets in the west regardless of where you are.
Some of the factors would be introduction of non native species, pollution, overgrazing, chemical agents and habitat loss
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Basically the improvements in transportation created economic growth and more job opportunities.
