GEOS 170A1 Lecture Notes - Lecture 2: Slack Technologies, Exoplanet, Plate Tectonics
19 Jan 2017
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1920s-30s we"ve been able to broadcast radio signals into galaxies. Earth is basically a tiny speck compared to everything else in our solar system. First exoplanet found in habitable zone of its star. Looks at thousands of stars at once for transmitting earth like planets. All earth would get irradiated by things from the sun if we didn"t have this. Co2 is maybe even more important than o2, keeps us warm, keeps us able to have plants, Much of the volume of the planets is a thick atmosphere overlying oceans of liquid gases. How do we know our solar system is 4. 6 billion years old?- Characterized by many moons and ring systems. Meteorites show around 4. 6 billion years, which is only the third of the age of our universe. Amount of stuff in a given volume. Ratio of mass to volume: d=m/v (g/cm^3) Density is a property of the material. Weight depends on how much of the material you have.
