Newtons law of Gravity is more general when compared to Kepler's laws of motion. Discuss in a few sentences what I mean by general in the above sentence. In science a theory that is more general is usually considered better. Include an example of when Kepler's laws cannot be used but Newton's law can. Telescopes List the qualities astronomers look for in an observing site.
Astronomers often choose very faint objects in the sky to study.
This particular advantage exists even if you are just looking through the telescope with your eyes. Suppose that the ecliptic and the celestial equator were not tilted with respect to each other. You are an astronaut on the moon. You look into the sky, and see the Earth in its Full phase. The speed of light is 300,000 kilometres per second.