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Galaxy Size Comparison | 3D Universe Size Comparisons
Learn the sizes and shapes of different Galaxies with this 3D Universe Size Comparisons video by KLT!
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What Is Stellar Evolution? | Facts About The Lifecycles of Stars
Learn about the evolution of a star and how stars are created and develop with this Stellar Evolution video by KLT!
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The Big Bang Theory
This video explains the formation of the universe as described by the Big Bang theory.
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9 Most Important Astronomical Discoveries
From ancient civilizations to modern breakthroughs, learn about the nine most important cosmic discoveries that changed the way we look at our Sun, Moon and beyond. Learn how Copernicus challenged the status quo, Kepler unveiled the...
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What Is Pi (π)? Is It Infinite?
Pi (π) is a fascinating number with many applications in mathematics, physics, and engineering. Its infinite decimal representation is a reminder of its fundamental nature in the universe. Mathematician Johann Lambert proved that pi is...
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What is Blackbody Radiation: Explained in Simple Terms
A black body is a theoretical or imaginary object that perfectly absorbs all incoming electromagnetic radiation, and also emits radiation, like heat and visible light, based on its temperature. A black body is considered theoretical...
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The Best Books I Read in 2021 | AI, Science Fiction, and more!
I read 104 books in 2021. Here are some of my favorites!
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Inner and Outer Planets
Inner and Outer Planets compares and contrasts the properties of the inner and outer planets.
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Constructing Knowledge
UC Berkeley historian and Byzantine specialist Maria Mavroudi describes how the standard view of the Middle Ages science fails to take into account the creative process of systematizing and building upon prior views.
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Ancient Culture Wars?
Classical scholar Richard Janko, University of Michigan, describes his conviction that the famous trial of Socrates in 399 BCE was hardly a unique event in Classical Athens, but rather one in a series of battles between religious...
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The Sun
The Sun identifies the sun as one of many stars that exist in the universe by recognizing that the sun appears to be the largest star in the sky because of how close it is to Earth in relation to other stars.
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Dark Matter
University of Pennsylvania physicist Justin Khoury describes how, while many are convinced of the existence of dark matter rather than changing our understanding of the laws of gravity, we can’t yet be sure what the final outcome will be.
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A Big Contradiction
Nobel Laureate Roger Penrose, University of Oxford, describes a profound puzzle that he's been wrestling with throughout his entire research career: how is it possible that the universe began in a peculiar state of both minimum and...
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Seduced by Inflation
Princeton cosmologist Paul Steinhardt recalls his initial enchantment with cosmic inflation when he first heard Alan Guth suggest it in a talk in 1982.
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Measured Desperation
Physicist Paul Steinhardt, Princeton University, describes how many practicing scientists confidently assume that the unsolved problems of a theory will eventually be rectified rather than embracing the uncomfortable prospect of starting...
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Information Loss in Black Holes
Theoretical physicist and Nobel Laureate Roger Penrose (Oxford) describes why he thinks Stephen Hawking was wrong to change his mind about information loss in black holes.
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Inflationary Concerns #2 - The Initial Conditions Problem
Cosmologist Paul Steinhardt (Princeton) describes the so-called "initial conditions problem" that makes cosmic inflation very hard to start.
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An Unforgettable Talk
Physicist Paul Steinhardt, Princeton University, describes how his interest in inflationary cosmology was piqued by a captivating talk given by Alan Guth 30 years ago, and how what he thought was going to be a few weeks' diversion has...
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The Brain Barrier
Duke neuroscientist Miguel Nicolelis describes how all human knowledge, even matters such as basic physics that seem completely independent of human experience, naturally depend on the nature of our brains.
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Citizen SETI
Astronomer Jill Tarter, Director of the Search for Extraterrestrial Intelligence Institute, describes some of the Citizen Science projects that SETI is running to get the general public involved in analyzing large data sets.
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Singularly Uniform
Nobel Laureate in Physics Roger Penrose (Oxford) muses on the ironies associated with his work on singularities when applied to cosmology.
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Cosmological Amnesia
Nobel Laureate Roger Penrose muses on how, despite being aware of the potential cosmological constant for many decades, most physicists were shocked when dark energy (commonly associated with such a constant) was observationally detected.
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Communicating Physics
Imperial College cosmologist Claudia de Rham describes her encounters with members of the general public and her conviction that it's important not to convey to the public that ideas in progress are not "the final answer".
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The Cosmological Constant Problem
Cosmologist Justin Khoury (Penn) describes what many have described as "the worst failure of contemporary theoretical physics".