Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
....
students calculate the age for the universe based on how much galaxies
appear to have moved in a certain amount of time (the materials are two
copies of many dots, the top one a transparency with the dots expanded
on a copier).