01:750:110 Lecture Notes - Lecture 1: Interstellar Cloud, Astronomical Unit, Light Pollution
Document Summary
Light pollution causes places of high concentration to see stars light as being dull and faint (ex. Large glowing ball of gas that generates heat and light through nuclear fusion. The sun is a start just like those we see in the sky at night. Open cluster- a few thousand loosely packed stars. Globular cluster- up to a million stars in a dense ball bound together by gravity. A great island of stars in space, all held together by gravity and orbiting a common center (ex. The sum total of all matter and energy; being everything within and between all galaxies. Almost all points of light that we see at. Milky way galaxy alaxies (local group) ters (virgo cluster) rs (local supercluster) out 4. 2 ly axy: about 2. 5 million ly alaxy: 100,000 ly. Earth-sun avg. distance: 1 au, 150 million km.
