Announcements First to last quiz due tonight :-)

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Presentation transcript:

Announcements First to last quiz due tonight :-) Start working on problem sets if you haven't done so yet! → Due by end of semester, worth 10% of final grade Stargazing Blitz Week this week, Dec. 1-4: stargazing every night this week, 8-9 pm on 5th floor of Physics building → 1% bonus on final grade

Plan for Rest of Semester Only 5 classes left before final! Today: Large Scale structure, age of universe Wednesday: Big Bang, Cosmology Friday: Life in the Universe Monday next week: ??? → Ideas? Behind the scenes of an observing run / More review / Other topics → Let me know Wednesday next week: Review for Final

Finding the age of the Universe Three independent ways of finding the age of the universe and of its oldest stars and galaxies: Dating the oldest globular clusters by using their H-R diagrams to see what stars have evolved off the main sequence: Today’s best estimate: 11-13 billion years since first stars formed in globular clusters Using Hubble’s law to deduce when the galaxies were all at a single point - when the Big Bang occurred: 14 billion years Finding the most distant objects and finding that they are about 13 billion light years away.

Big Bang Nucleosynthesis Shortly after the Big Bang densities were similar to those in the core of stars (i.e. dense & hot) → Fusion of Hydrogen to mostly Helium and little else

Big Bang Nucleosynthesis Source: http://journals.aps.org/prd/article/10.1103/PhysRevD.82.105005

As predicted, the cosmic microwave background has a nearly perfect blackbody spectrum with a temperature about 3 K.