Introductory Astronomy Complete University Course - The Milky Way's Many Faces

This video is part of a comprehensive series initially developed for William Paterson University and CUNY Hunter, aimed at supporting online classes and course materials for introductory astronomy. By engaging with all the videos within this series, you will effectively complete a full undergraduate course in astronomy, equipping yourself with the knowledge and skills necessary to navigate the night sky with confidence, learning all the basics and many advanced topics! Embark on an incredible journey into the Milky Way, one of the most stunning sights in the night sky. Often hidden by light pollution, I’ll take you on a visual adventure to rediscover its true beauty and its deep connection to human history. I’ll share my personal experience from Colorado during the 2017 total solar eclipse. From a friend’s porch, I captured a breathtaking 60-second exposure of the Milky Way using a regular DSLR. It’s a shimmering band of light, dotted with dark patches of dust, spiraling across the sky, our entire galaxy! Throughout history, the Milky Way has captivated countless generations. But light pollution has made it hard to see it clearly. I’ll show you amazing images of the Milky Way and tell you how our ancestors saw it, from the deserts of Australia to the coast of Maine. This band of light is a connection to our culture that goes back thousands of years. People have called it the celestial river and the backbone of the night. Next, I’ll talk about galaxies. They’re huge collections of stars, gas, and dust held together by gravity. Our Milky Way and our closest neighbor, the Andromeda Galaxy, are both huge. The Milky Way has hundreds of billions of stars, while the Andromeda Galaxy has even more. But there are also smaller galaxies with just a few million stars. As we explore the Milky Way, we’ll uncover its secrets through different types of light. Optical light reveals a dusty band of stars, infrared views show warm dust tightly packed in the Milky Way’s plane, and radio waves from neutral hydrogen gas give us clues about cold, spread-out regions. I’ll give you a complete picture of the Milky Way using observations from different space telescopes and instruments. First, we’ll examine the Planck satellite’s observations of microwaves, revealing carbon monoxide and other gases that indicate the distribution of hydrogen throughout our galaxy. Next, we’ll discuss synchrotron radiation, a type of radiation detected by radio observatories from electrons spinning within the magnetic field of the Milky Way. Then, we’ll explore X-ray and gamma-ray observations, which help us identify high-energy sources like black holes, neutron stars, and blazars. These observations reveal the dynamic and complex nature of the Milky Way, with various phenomena occurring. We can also compare the Milky Way to other spiral galaxies, such as Andromeda and the Pinwheel Galaxy, to gain a different perspective and identify similarities. Images from the Spitzer and Swift Space Telescopes showcase Andromeda’s dusty and star-forming regions, revealing the birth of stars in these areas. Prepare for an extraordinary cosmic journey through stunning images and mind-blowing scientific insights. We’ll explore the vast treasure trove of human astronomy knowledge within the Milky Way while simultaneously unraveling its mysteries with modern astrophysics. So, grab your binoculars and embark on a quest to discover the wonders of our galaxy. Imagine the Milky Way in a new light, inspiring us to seek out dark skies and connect with the celestial magic that our ancestors revered. 0:00 Introduction 2:57 The Milky Way, our Galaxy 4:58 What are Galaxies? 5:36 Full-sky views of the Milky Way 6:19 All-sky Milky Way in Optical light 7:57 All-sky Milky Way in H-alpha 10:45 AKARI InfraRed Camera JAXA 11:20 All-Sky Milky Way in Infrared by WISE 12:47 All-sky Milky Way in Hydrogeri emission 2lem 13:43 All-sky Image of Microwave Emission due to CO 15:17 All-sky Image of Microwave Emission (Planck) 16:06 Mapping the Milky Way's Gas and Dust 16:18 All Sky Milky Way in Radio 17:21 X-Ray Survey by RXTE 18:06 All sky Milky Way in X-Ray 18:39 All Sky Milky Way in gamma rays 20:35 New Discovery 23:04 M31 on APOD (2009, May 10) 23:11 Spitzer IR Telescope: M31 26:08 NGC 891: A Milky Way Analogue 28:49 REVIEW QUESTIONS #MilkyWay #Astronomy #GalacticJourney #StarGazing #LightPollution #CosmicExploration #NightSky #Galaxies #CelestialBeauty #SpaceScience