Abstract: Light pollution is a growing problem that affects not only astronomers but all people, as well as the flora and fauna of the planet. There is still widespread unawareness of this problem in the general public. The basics of light pollution should be taught in every Introductory Astronomy course. It can also be a part of a university or college’s Sustainability or “Green” theme.
In this presentation we will present slides that comprise both a primer on the topic and a discussion of the newest problems in light pollution. The basics will be centered around the Five Principles for Responsible Outdoor Lighting, co-developed by Dark Sky International and the Illuminating Engineering Society. The current hot topics in light pollution are LEDs and satellite constellations. LEDs are a problem because they typically have a blue-rich spectrum that interferes with the human circadian melatonin cycle. Satellite constellations are collections of satellites in Low Earth Orbit which provide internet service and, soon, direct-to-cell phone communication. These satellites reflect sunlight downward, especially after dusk and before dawn, causing streaks in stellar images taken for science or artistic purposes. The status and plans for these satellite constellations will be summarized.
This topic is not only appropriate for an Introductory Astronomy course but builds on many concepts already in such a course, including stars, imaging, orbits, and the electromagnetic spectrum. Such discussion in a course will add to the number of people who know about light pollution and educate others
