Prices of a stock will move throughout the day. Investors generally buy a stock they feel is undervalued, and sell a stock they feel is overvalued. For instance, if the price of AAPL is $600 dollars, it means the cost to purchase one share of Apple is $600 dollars.
Einstein quickly realized (or had known all along) that his new theory of gravity was really a theory of the cosmos. In 1917, he wrote a famous paper applying general relativity to the universe as a whole. Today that paper stands as the foundation for modern cosmology.
1 Einstein developed a whole new idea about Gravity. 2  According to Einstein, Gravity arises from the warping of space and time. 3  Einstein's new theory of Gravity explains a number of phenomena that would violate Newton's theory. 4  For example, light bends when passing near massive objects like the Sun.