ASTRONOMY.docx - ASTRONOMY Week 1 1. In astronomy we deal...

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ASTRONOMYWeek 11.In astronomy we deal with large and small numbers.a.3,400,000= 3.4 * 10^6. Move the decimal place to get the 62.Names for powers of 10a.10^3= Kilob.10^6= Megac.10^9=Gigad.10^12=Terae.10^15=Peta
3.Orders of magnitude (curly o)a.100=10^2= order of magnitude (2)4.Compare the mass of the sun to the mass of an electron
5.Astronomy falls under physics6.Astronomy= getting data7.Astrophysics= explaining the data8.Our sun is the largest object in our solar system9.Radius of the sun is 109 times bigger than the earth10. Mass of the sun is 100,000 times the mass of the earth11. Density=massvolume= P12. Volume=43πr313. P=1,40014. Density of earth= 5,50015. Density of water= 100016. Composition of sun 74% hydrogen, 25% Helium, 1% other17. Differential rotation18. Equator= 25 days19. Poles=35 days20. Sun is 5 billion years old21. Earth to sun distance is 1.5*10^8 km22. Temperatures of the suna.Surface =5800 kelvinb.Core= 15 million kelvin23. Kelvin is the temperature scale used in astronomy24. Zero kelvin = all motion stops25. Suns luminosity
26. Kelvin + Helmholtz
27. 1 joule= watt * seconds28. Using these numbers (10^-19, 3.9x10^26) we find that the time is 10,000 years29. Since the geological/fossil record on earth tells that the sun is at least 3 billion years old,kelvin and Helmholtz theory must be wrong30. Suns atmospherea.3 regionsi.Center= photosphereii.Middle= chromosphere (10,000 kelvin)iii.Outside= corona (1 million kelvin)b.Photospherei.5800kii.Most of the EM radiation is in the visible rangec.Chromospherei.10,000kii.Most of it is in the UVd.Coronai.1,000,000kii.X-rays
31. Sunspots are cool regions on the photosphere.a.11-year cycle of sunspot activity32. Galileo determined the rotation rate by watching the sunspots33. Charged particles (electron) will have a force on them due to the magnetic field.34. Filaments are created by the magnetic field line; it traps some if the suns elements.35. Prominences is the same as a filament but it’son edgeWeek 236. Mattera.Matter is made up of atomsb.Atoms can combine to form molecules. Collection of molecules constitutesmatterc.A famous moleculei.H2O= waterd.Atom is made of a nucleus and surrounded by electronse.In the nucleus we have protons and neutronsf.Helium= 2 protons in the nucleus
g.For electrical charges like charges repel and unlike charges attract. So, this is whythe electrons, which have negative charge => -1.6x10^-19 colonies, are attractedto the nucleus.

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Term
Fall
Professor
BrianWoodahl
Tags
White dwarf

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