https://physlab-wiki.com/ 2026-04-16T18:14:28+00:00 https://physlab-wiki.com/ https://physlab-wiki.com/lib/tpl/UChicago/images/favicon.ico text/html 2021-11-05T17:49:45+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/special_topics/astronomy/expansion_of_the_universe?rev=1636148985&do=diff Expansion of the Universe A weather balloon is inflated with a shop vac. The distance between marks made on the balloon increases at a rate proportional to their separation. F5, F1 PIRA DCS 8C10.35 text/html 2021-11-05T17:49:10+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/special_topics/astronomy/gravity_well?rev=1636148950&do=diff Gravity Well A spiral wishing well can be used to demonstrate the effect of gravity on orbiting objects. Stability and gyroscopic effects can be explored using coins. G top text/html 2021-11-05T17:49:57+00:00 Anonymous (anonymous@undisclosed.example.com) https://physlab-wiki.com/physicsdemos/special_topics/astronomy/start?rev=1636148997&do=diff astronomy index