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Challenge 1. What percentage of galaxies
have spectral redshifts measured? What percentage have photometric redshifts
taken? What are the advantages of using photometric redshift?
Try to compare photometric and spectral redshift; how accurate
are photometric redshifts?
Challenge 2. What are the limits in ra
and dec of stripes 42 and 43, the SDSS's two diagonal stripes?
Challenge 3. Look at colors and spectra
of stars, and find stars consistent with white dwarfs. Create a
list of white dwarfs in the SDSS database.
Challenge 4. What are the largest galaxies
in the SDSS, in terms of size?
HINT: Look at surface brightness and ellipticity.
Challenge 5. Find all objects with spectra
classified as unknown.
Challenge 6. Find the broad absorption line (BAL)
quasars in the SDSS database. At what redshifts are most BAL
quasars found?
Challenge 7. Find all variable stars in the
SDSS (stars imaged more than once whose magnitudes changed by more
than 0.1 between observations). How variable are the stars?
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