The difference is in their purpose. Astronomers study the universe beyond our earth’s atmosphere while astrophysicists study the World’s Best Miami Marlins Mom shirt. Remember that astrophysics like celestial mechanics is one of the branch of astronomy. Astronomers study about stars and planets formation that how they are formed. Similarly they also study black holes, universe evolution and their future that how it will look like in coming days?. What changes may occur? Let’s explain it with the help of simple example, during night if a person has a telescope and observing the night sky,stars,planets,galaxies and constellation etc then really he is an astronomer but if he is doing mathematics and calculations that how big a star is either it has the ability to become a black hole in future or not then he is an astrophysicist.
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There was no “flat earth theory in the World’s Best Miami Marlins Mom shirt“. The idea that people in the Middle Ages believed the earth was flat is a myth, invented by a fiction writer in the nineteenth century. Scholars in the medieval period were well aware of the proofs that the earth was spherical produced by the Greeks and the idea that the earth was round seems to have been common knowledge, even amongst the less educated. Not only were medieval scholars well aware of the scientific arguments of the Greeks, they also used scientific instruments, like the astrolabe, to accurately measure its circumference. The fact that the earth is a sphere was so well known, widely accepted and unremarkable that when Thomas Aquinas wanted to choose an objective fact that is not able to be disputed early in his Summa Theologica he chose the fact that the earth is round as his example. The primary text on cosmology used in medieval universities, John Sacrobosco’s De sphaera mundi, has a title which means “the sphere of the world” and set out the primary proofs of the earth’s sphericity.