PR is not assigned to domains, PageRank is assigned to individual web pages. Not all pages of nasa.gov will have the same PR, so which page it is on matters a great deal. Also, the link juice will be divided by a number of outbound links on that same page, so again, which page it is on matters.
The Conversion tracking code is a client-side script that runs after the page in which it is placed has finished loading. It requires about 1