

Understanding the Universe: An Introduction to Astronomy, 2nd Edition
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Platí smluvní podmínky
Epizody
S1 E1 – A Grand Tour of the Cosmos
18. října 202333 minYou embark on a fantastic voyage throughout the Universe, starting in this lecture with a whirlwind tour of the course, which extends from phenomena in Earth's atmosphere to events at the farthest reaches of space and time.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E2 – The Rainbow Connection
18. října 202330 minThe daytime sky contains intriguing natural sights that offer a colorful introduction to astronomy. One such phenomenon is the rainbow. This lecture examines how a rainbow is created and how it appears under different circumstances.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E3 – Sunrise, Sunset
18. října 202332 minContinuing the study of the daytime sky, this lecture examines phenomena associated with sunrise and sunset, including the elusive green flash, Buddha's rays, and Earth's own shadow at sunset.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E4 – Bright Objects in the Night Sky
18. října 202331 minMany objects in the night sky can be enjoyed with the naked eye, even from the city. These include several famous constellations, bright stars, planets, and satellites such as the International Space Station.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E5 – Fainter Phenomena in the Night Sky
18. října 202331 minFar from city lights, the night sky becomes spectacular and includes such sights as the Milky Way, the Magellanic Clouds, zodiacal light, and comets. Though not technically "celestial," auroras are also wondrous spectacles.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E6 – Our Sky through Binoculars and Telescopes
18. října 202330 minA relatively inexpensive telescope and even a simple pair of binoculars greatly increase the number of celestial objects you can study, such as the craters on the Moon, the Orion Nebula, and the Andromeda Galaxy.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E7 – The Celestial Sphere
18. října 202333 minAs Earth rotates on its axis and orbits the Sun, the night sky changes over a 24-hour period, as well as throughout the year. This lecture explains how to locate celestial bodies and why the sky appears different from place to place.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E8 – The Reason for the Seasons
18. října 202331 minContrary to popular belief, the seasons are not caused by changes in the distance between Earth and the Sun over the course of a year. Instead, the tilt of Earth's axis of spin relative to the axis of its orbital plane produces seasons.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E9 – Lunar Phases and Eerie Lunar Eclipses
18. října 202331 minLunar phases occur as the Moon orbits Earth, changing the viewing perspective of the Moon's illuminated hemisphere. Lunar eclipses take place when Earth, the Sun, and Moon are almost exactly aligned.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E10 – Glorious Total Solar Eclipses
18. října 202331 minTotal solar eclipses are stunning celestial sights, which occur when the Moon comes between Earth and the Sun, totally blocking the Sun for a small portion of the Earth. These rare events reveal beautiful and thrilling phenomena.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E11 – More Eclipse Tales
18. října 202331 minSolar eclipses also come in annular and hybrid varieties, reflecting the varying distance of the Moon from Earth. A famous total solar eclipse in 1919 provided observational evidence for Einstein's general theory of relativity.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E12 – Early Studies of the Solar System
18. října 202329 minAstronomy has its roots in the ancient civilizations of Mesopotamia, Babylon, India, Egypt, and China. The Greeks in particular developed sophisticated and sometimes surprisingly accurate theories of the nature of the heavens.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E13 – The Geocentric Universe
18. října 202330 minThe Greek philosopher Aristotle concluded that Earth is stationary at the center of the Universe, surrounded by 55 nested spheres. Ptolemy elaborated this geocentric model into a system that held sway for nearly 1,500 years.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E14 – Galileo and the Copernican Revolution
18. října 202331 minIn 1543, Copernicus proposed a heliocentric system, in which Earth and other planets orbit the Sun, which is at the center of the Universe. In the early 1600s Galileo provided strong evidence for this model with the newly invented telescope.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E15 – Refinements to the Heliocentric Model
18. října 202331 minThis lecture explores the refinements in the Copernican model made possible by Tycho's extremely accurate measurements of planetary positions, which were analyzed by Kepler to produce his laws of planetary motion.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E16 – On the Shoulders of Giants
18. října 202332 minAccording to legend, Newton saw a falling apple and realized that the force that pulled it toward Earth also pulled on the Moon, keeping it in its orbit. Building on the work of Kepler and Galileo, he revolutionized astronomy with his law of universal gravitation and laws of motion.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E17 – Surveying Space and Time
18. října 202331 minObservations of the transit of Venus across the face of the Sun in the 18th century helped determine the scale of the Solar System. In the wider Universe, distances are so vast that the finite speed of light means we are literally looking back in time.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E18 – Scale Models of the Universe
18. října 202331 minThe best way to understand the size of the Universe is to investigate it in a series of steps, each 10 times larger or smaller than the one preceding. In this way, you explore the cosmos from the smallest to the largest scale.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E19 – Light-The Supreme Informant
18. října 202331 minAstronomers obtain most of their information through the analysis of light. This lecture introduces the electromagnetic spectrum and the technique of spectroscopy, in which light is dispersed into its component colors, as in a rainbow.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E20 – The Wave-Particle Duality of Light
18. října 202330 minDelving deeper into the nature of light, you explore the strange duality between electromagnetic waves (light waves) and particles (photons), which is a fundamental feature of quantum theory.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E21 – The Colors of Stars
18. října 202331 minThe surface temperature of a star determines its apparent color. The hottest stars are bluish in color, and the coldest stars are reddish; stars at intermediate temperatures appear white. The Sun is a white star.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E22 – The Fingerprints of Atoms
18. října 202331 minElectrons jumping between different energy levels in atoms emit and absorb photons in a characteristic way for each element. Thus, astronomers can use the light from distant objects to deduce their chemical compositions.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E23 – Modern Telescopes
18. října 202331 minToday's telescopes are designed to provide huge light-gathering mirrors at relatively low cost. The mirrors focus light from distant objects onto sensitive electronic detectors that are far more efficient than traditional photographic film.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E24 – A Better Set of Eyes
18. října 202331 minThis lecture looks at radio telescopes, adaptive optics for ground-based infrared telescopes, and NASA's Great Observatories, which include the Hubble Space Telescope, Chandra X-Ray Observatory, and Spitzer Space Telescope.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupteS1 E25 – Our Sun, the Nearest Star
18. října 202330 minBeginning a sequence of lectures on the Solar System, you start with the Sun, which you explore from the interior to the surface. Sunspots are cooler regions associated with strong magnetic fields, and violent eruptions blast solar material into space.Předplaťte si kanál The Great Courses Signature Collection nebo The Great Courses Signature Collection & Living, nebo si obsah kupte