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How do we know how stars form
Transcript of How do we know how stars form
How Stars Form? How Stars Form How Do We Know? Observations Theories Experiments Sources Sources - Huge cloud of gas -No phsycial observations of an actual star forming have been preformed -The Magnetorotational Instability (MRI) experiment was preformed at the Princeton Plasma Physics Laboratory (PPPL) -Theory of stellar genesis http://www.ph.surrey.ac.uk/astrophysics/files/how_stars_form.html http://www.ldolphin.org/stars.html - Gases begin to be compressed by Gravity into ball - Gravitational compression heats up gases - Heating of gases causes particles to move at faster rate - Particles are composed of hydrogen -Particles go so fast they finally bump into each other -Fusion occurs and helium is formed - -Gas ball heats so much it glows A star is formed! -Observations -Experiments -Theories - Infarred sources give evidence of collapsing protostars
*Protostar= parts broken away from cloud core; has own gravity http://www.musicanthology.org/?p=74 http://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve/ http://www.astro.yale.edu/sf_frontiers/presentations/vandokkum.pdf http://www.jwst.nasa.gov/birth.html http://abyss.uoregon.edu/~js/ast122/lectures/lec13.html -We also look at young stars and see that they are surrounded by clouds of gas http://phys.org/news82916955.html *accretion disk in which stars form from are made of plasma, dust, other materials -Experiment simulates accretion disk with material in place of plasma, dust, and other materials. http://www.icr.org/article/7113/ -looking at light that hot gas clouds in outer space make that certain stars generally come from -Scientists use irradiated materials along with ions to test to show how dust in our galaxies work https://e-reports-ext.llnl.gov/pdf/315239.pdf *use electron microscophy and energy dispersive x-rays to test chemical changes in gases; much like stars would in our galaxy -Kepler telescope *stars are formed in vast clouds of interstellar gas and dust. -Hubble Telescope gives look into nurseries where stars form to see process http://www.ph.surrey.ac.uk/astrophysics/files/how_stars_form.html http://www.nasa.gov/mission_pages/kepler/main/index.html http://iopscience.iop.org/0034-4885/34/1/302 Scientists suggest that interstellar gas clouds might be rapidly changing *due to this interstellar conditions may change forming stars