ESCI 101 Lecture Notes - Lecture 2: Scientific Method, Blueshift, Uniformitarianism

• School: Rider University
• Department: Earth Science
• Course: ESCI 101
• Professor: Jeffry Nittrouer

Document Summary

Create own science law (theory hold to rigorous testing) Vs our moon - lots of craters that are close together, our moon is dead (no tectonic. Assumption : asteroid impacts are constant in our solar system, not preferential asteroid impact. Hypothesis: planets with active surface process --> craters are destroyed no asteroid crater = active surface processes. Earth has faster and more dynamic surface processes (higher rate) than mars, so earth doesn"t have as many visual craters. Hubble 1929 - galaxies are moving away from each other. How do we know - doppler effect o o o. Blue shift - moving towards you - pitch increases. Red shift - moving away from you - pitch decreases. All galaxies around us shifted towards red light spectrum. Theory: evolution of universe -- the big bang. Light reaching today is 13 billion years old. Processes on earth today are the same throughout time. Interpretation of past are based on what we observe now.