GEOG 101 1st Edition Lecture 4Outline of Last Lecture I. FeedbackII. Electromagnetic RadiationIII. Types of EnergyOutline of Current Lecture I. Review: Latent HeatII. SpaceA. What the exogeography of the Solar System tells usIII. ExtraterrestrialsA. The Drake EquationIV. Why Earth is habitable and a rare planetCurrent LectureI. Review:Latent Heat: -Absorbed from the environment reduces sensible heat (evaporation)-Released to environment increases sensible heat (condensation)II. Space-The Earth revolves around the sun while rotating.-The Moon revolves around the Earth-The Earth is a tiny speck in the Milky Way Galaxy-1995: The first extra-solar (exoplanet) was discoveredA. What the exogeography of the solar system tells us:Mercury: We’re lucky we’re farther from the sunVenus: We’re lucky our atmosphere is not that thickMoon (and Mercury): We’re lucky to have an atmosphereMars: We’re lucky to have a substantial atmosphereJupiter, Saturn, Uranus, Neptune: We’re lucky we’re on a terrestrial planetPluto, Ceres, and other dwarf planets: We’re lucky the Earth is near the sunIII. ExtraterrestrialsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.A. The Drake Equation is a means of estimating the probability of extraterrestrial life. It is mostly a thought experiment because we lack data. The knowledge of exoplanets help “solve” The Drake Equation. IV. Why Earth is habitable and a rare planet:Earth’s Axis: tilts 23.5 degrees and is the primary cause for seasons.1. We’re not crushed by interplanetary gravity or irradiated by massive planets.2. We’re not cooked or irradiated by the Sun3. Our orbit is barely elliptical.4. Our axis of rotation tilts, but not too much5. We have the right mix and arrangement of chemicals6. The planet and humans have been very lucky not to be hit by a giant asteroid likethe one that wiped out the dinosaurs. If there is another habitable planet, we can’t travel or communicate with is because it is too far