Astronomy 2021A/B Chapter Notes - Chapter 2: Human Genome Project, Runaway Greenhouse Effect, Guanine
9 Feb 2017
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Document Summary
Three ideas that frame universal context in the book. The same physical laws that operate on earth operate throughout the universe. 2. 2 the structure, scale, and history of the universe. Milky way contains more than 100 billion stars and orbits the galactic center once every 230 million years. Milky way is one of the two largest among more than 70 galaxies in the local group, located in the local supercluster called laniakea. Groups of galaxies with more than a few dozen large members are often called galaxy clusters. 1 light-year is the distance that light can travel i n1 year, which is about 10 trillion kilometers. The boundary of our observable universe is 14 billion light years. Radiative energy - energy carried by light. Light is characterized by an eelctromagnetic wave, characterized by wavelength and a frequency (hz) Radio spectrum in much the same way a prism disperses white light into a rainbow of color.
