![]() ![]() As we'll see, a close to a black hole is one example. This only applies the Einsteinian theory in general relativity in situations where the gravity is very strong. Far away, the theory of Newton would apply. Objects with lots of mass and energy will curve space and distort time nearby. Mass-energy tells spacetime how to curve while curved spacetime tells mass-energy how to move. The Einsteinian concept is quite different. ![]() The Newtonian concept is that mass tells gravity how much force to exert and the force tells the mass how to move. They are part of a four-dimensional construct called spacetime. Space and time are interchangeable and one can be changed into the other in different situations in the real universe. He links them formally with the equation E equals mc squared. But to Einstein, mass and energy are interchangeable. Space and time are very different things. To Newton, mass and energy are very different things. Making this comparison throws into sharp relief just how dramatic and revolutionary general relativity was. These two very great scientists had completely different ways of thinking about the nature of gravity in space. Let's compare the worldviews of Einstein and Newton regarding space and time. What came before the Big Bang? Is there anything outside our universe? What is reality? We'll finish by looking at the role of life in the universe and ask whether the earth is the only place with biology on it. At the end, will ask questions that don't necessarily have answers. Finally, we will discuss how modern cosmology has shown us that we live in an ancient universe (14 billion years old), in one galaxy in a universe of hundreds of billions of galaxies. We will then learn about the revolutions in physics in the early 20th century that redefined our ideas of space and time, mass and energy. We'll then examine the revolutions of Copernicus, Galileo, and Newton that redefined our place in the universe. We will start with prehistoric cultures who kept accurate calendars and move through the time of the Greek philosophers who laid down the rudiments of logic and mathematics and the modern scientific method. We'll look at how humans learned to ask questions about the universe, and even before the invention of modern instruments like the telescope, learned some amazing things about their place in nature. Range comparisons refer to standard laptop with all-metal chassis design.This is an introductory level course about the history and philosophy of astronomy, the oldest science. Interference from USB 3 devices may vary according to the device. Actual WiFi range and performance may be affected by environmental factors. WiFi Master test configuration: under controlled test conditions, streaming FHD YouTube videos, and AP set with one antenna at 802.11g. ![]() If NumberPad option is chosen, touchpad with fingerprint sensor option is not available. Please note that all versions of NumberPad only work with the Microsoft Windows operating system. Actual effective antibacterial-protection period may vary depending on product configuration and usage. The tests provide a simulation of three years of wear and tear, and include exposure to salt spray, thermal shocks, and both alcohol and wool-felt tests.
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