ASTR 101 Lecture Notes - Lecture 1: March Equinox, Orbital Period, Lunar Month
Document Summary
Natural science that tries to explain, understand and predict observations of the world around us. Study of celestial objects (outside the earth"s atmosphere sun, moon, stars, planets, galaxies) Understanding the universe and our place in it. Physics motions of planets and celestial bodies and predict the future. How does matter work (dark matter, dark energy) Earth (planet) > solar system (solar interstellar neighborhood) > milky way > local group (galactic group) > virgo supercluster (supercluster of galaxies) > observable universe. We can"t see things from 45. 6 billion light years away. As we look further away, we look back in time. Constellations are in the milky way (in our own galaxy) Average distance between the earth and the sun. Distance that light travels in one year. How long does it take for light to travel through space in one year. Time it takes for light to travel from one place to another.
