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Class Works For Entire Semester (highest grade in class)

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Louisiana State University
ASTR 1101

CLASSWORK2For a scaled model of the SolarSystem and nearby stars adopt a scalewhere the diameter of the Earth isscaled to 1 foot Just like the standard globeOn this scale the EarthMoondistance 1 ltsecond is 33 feet1 One this scale how far would wehave to place the Sun from theEarthThe slide showed that the EarthSun distance is 8 lightminutes This is 8X60480 timeslarger than the EarthMoon distance On the scale model the EarthMoondistance is 33 feet so the EarthSun distance is 33x480 feet or 15840 feet orclose to three miles Zowie for the small globe in our classroom we would haveto place the Sun three miles away which would be like in northern Baton RougeThat is a lot of empty space between the Earth and the Sun2 On this same scale how far do wehave to placeCentauri the closeststar to our own SunThe slide showed that the EarthCen distance is about 4 light years This is4X365X24X60X60126000000 lightseconds With the EarthMoon distanceie about one light second being 33 feet then the EarthCen distance is about33X126000000 feet away from our globe or about 4000000000 feet or about800000 miles This is a couple of times farther than the real EarthMoondistance Zowie the space between stars is huge and vast and largely emptyCLASSWORK3PLANET AROUND HD209458Orbits around a star similar to our SunOrbital radius is 005 AU smaller than MercuryMass is about that of JupiterSize is about that of JupiterDensity05 gmcm31 What is its surface temperatureapproximatelyThe measured information on this planet is that it is with an orbital radius of 005 AUie d005 in Astronomical Units The equation for the temperature of planetsaround Sunlike stars is Tplanet260SQRTd This is 260005051160Kelvin That is hot enough to melt lead and copper2 Is the planet likely to be rocky gassy oricyGassy It cant be an icy planet as it is so hot because it is so close to its star It cantbe rocky because the measured density of the planet 05 times that of water ismuch too small for any type of rocks It cant be rocky with holes as then theplanet would have to be a fine lacework with 80 voids and this cannot besupported for any planet with the mass of half a Jupiter So the only type left isgassy And the density fits well for gas giants And the mass and size of Jupitersuggests strongly that it is indeed like Jupiter which is to say a gas giant3 Does the planet have Moons CratersRings Atmosphere VolcanosMoons Likely yes This is because the planet is like a gas giant and at least allthe gas giants in our own Solar System have many moons so it is reasonable to expectthat gas giants around other stars also have many moonsCraters No Gas giants cant have craters If an asteroid hit the surface of thegas giants the gas would rapidly flow back in to fill up any momentary voidRings Likely yes Again this is likely because the planet around HD209458 is agas giant and all the gas giants in our Solar System have rings so it is likely that theplanet also has ringsAtmosphere No or well gas giants are all atmosphereVolcanoes No No volcanoes on gas giant planets because there is no solidsurface to form them
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