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Solar System Chapter 27 Solar System • Solar System: consists of the sun, the planets, and all of the other bodies that revolve around the sun. Planets • Planets: a celestial body that orbits the sun, is round because of its own gravity, and has cleared the neighborhood around its orbital path. Nebular Hypothesis • Solar Nebula: a rotating cloud of gas and dust from which the sun and planets formed. Formation of Planets • Planetesimal: a small body from which a planet originated in the early stages of development of the solar system. Formation of the Planets • Protoplanets: collide with other bodies and become very large and eventually condense to form planets and moons. • Moons: are smaller bodies that orbit the planets. Inner Planets • Mercury, Venus, Earth, Mars • Close to the sun, contain heavier elements, solid surfaces, smaller, rockier, and denser Outer Planets • Jupiter, Saturn, Uranus, Neptune • Formed in colder regions, far from sun. • Considered gas giants, have low density. Terrestrial Planets • Terrestrial Planet: one of the highly dense planets nearest to the sun. (Mercury, Venus, Earth, Mars) Mercury • Smallest planet • Fastest orbit ~88 days • Iron core • First explored in 1973 by Mariner 10 • No atmosphere Mercury's Molten Core • Mercury’s surface is heavily cratered. • Temperature varies greatly. Venus • 7,520 miles in diameter • 67.2 million miles from the sun • 2nd brightest object in the night sky after the full moon • Morning/Evening “Star” • Has sulfur dioxide droplets in its upper atmosphere, which form a cloud layer that reflects the sunlight making it really bright. Venus • 225 Earth-days = 1 Venus year • 243 Earth-days = 1 Venus day • Atmosphere almost entirely CO2 • Atmospheric pressure 1,320 pounds per square inch (about 90 times Earth’s) • Surface temperature 465oC Missions to Venus • 1970’s Soviet Union: sent probes and viewed a rocky landscape. • 1990’s USA: sent a satellite and discovered mountains, volcanoes, lava plains, and sand dunes. Earth • Orbital Period: 365 days • One rotation on its axis every day. • Earth is unique with water being in a liquid state. • Moderate Temperatures due to atmosphere. • Oxygen in atmosphere because of plants. Luna = Our One Large Moon Mars • • • • Orbital Period is 687 days. Rotates on its axis every 24hr and 37 minutes Almost same axis tilt as Earth, very similar seasons. Volcanoes, Valleys, No moving tectonic plates Mars • Pressure and Temperature of Mar’s atmosphere are too low for water to exist as a liquid, yet we believe it did exist at one time. • Temperatures vary from 20C near poles to -130C at the equator. Mar’s Rover - Curiosity • Video – “7 minutes of Terror” • Nasa Website The Outer Planets • Jupiter, Saturn, Uranus, Neptune • The outer planets are separated from the inner planets by a ring of debris called the asteroid belt. The Outer Planets • Jupiter, Saturn, Uranus, Neptune • Gas Giants: a planet that has a deep massive atmosphere made mostly of gas. The Outer Planets • Their thick atmosphere is mostly made of hydrogen and helium gases, forming a cloud layer. • All four gas giants have ring systems that are made of dust and icy debris that orbit the planets. Jupiter • Largest Planet • Its mass is more than 300 times that of Earth. • Orbital period – 12 years • Rotates on axis the fastest (9 hr 50 min) • Jupiter has 60 moons • Thin rings Jupiter’s Moon Io Jupiter's moon Europa Jupiter’s Coloring • The coloring suggests the presence of organic molecules mixed with ammonia, methane, and water vapor. • Jupiter’s rapid rotation causes these gases to swirl around to form bands. • Average Temperature -160C • Lightening Storms and Thunderstorms are common. Great Red Spot • The Great Red Spot is an ongoing massive hurricane storm that is about twice the diameter of Earth. • This storm has been raging for several hundred years. Saturn • • • • Orbital Period of 29.5 years. 47 Moons Least Dense Planet Most complex/Extensive system of rings • Rotates on axis 10hr30 min • Saturn bulges at its equator and flattens at its poles. Saturn's moon Enceladus Uranus • • • • • • 24 Moons 11 Thin Rings Orbital Period 84 years Unusual Orientation Rotates every 17 hr Blue-Green color suggests that the atmosphere contains amounts of methane. Uranus' moon - Miranda Neptune • • • • • • Orbital Period is 164 years Rotates about every 16hr 13 Moons 6 Rings Roman God of the Sea White Clouds - frozen methane. • Strongest Winds • The Great Dark Spot Neptune's moon - Triton Pluto • Dwarf Planet • Orbits in an unusual elongated and tilted ellipse. • Smaller than Earth’s Moon • Made of frozen methane, rock, and ice. Kuiper Belt • Kuiper Belt: a region of the solar system that starts just beyond the orbit of Neptune and that contains dwarf planets and other small bodies made mostly of ice. Other Solar System Bodies Early Models of the Solar System • Ptolemy’s Model: Earth is centered and the planets move around Earth • Copernicus’s Model: the planets are moving at different speeds around the sun. Kepler’s Laws of Planetary Motion • Eccentricity: the degree of elongation of an elliptical orbit. • Orbital Period: the time required for a body to complete a single orbit. • Inertia: the tendency of an object to resist being moved or changed until an outside force acts on the object. Formation of Solid Earth • Differentiation: occurred on Earth when denser materials sank to its center and less dense materials were forced to the outer layers. • (3 distinct layers: core, mantle, crust) Formation of Earth’s Atmosphere • Earth’s early atmosphere formed as volcanic eruptions released nitrogen, water vapor, ammonia, methane, and carbon dioxide. • Present Earth’s atmosphere is 78% nitrogen, 21% oxygen, and 1% other gases. Formation of Earth’s Oceans • Earth’s water came from space as ice bodies (comets) collided with Earth. As Earth cooled the water vapor condensed and formed rain. • Over millions of years the water cycle occurred causing our oceans to become salty. Group Planet Assignment Each Group Will: • Research their assigned planet/objects – Include • Size and distance data • Composition • Human exploration efforts • Human colonization possibilities • Prepare a poster with a drawing and important information • Prepare a 3 – 5 minute presentation for the class. You may include web/electronic resources if prepared in advance.