Pressing SPACE will scroll the current article forward one page, or, if you have come to the end of the current article, will choose the next article (gnus-summary-next-page).

Scroll the current article back one page (gnus-summary-prev-page).

Scroll the current article one line forward (gnus-summary-scroll-up).

Scroll the current article one line backward (gnus-summary-scroll-down).

(Re)fetch the current article (gnus-summary-show-article). If given a prefix, fetch the current article, but don't run any of the article treatment functions. This will give you a ``raw'' article, just the way it came from the server.

Scroll to the beginning of the article (gnus-summary-beginning-of-article).

Scroll to the end of the article (gnus-summary-end-of-article).

Perform an isearch in the article buffer (gnus-summary-isearch-article).

Select the article buffer (gnus-summary-select-article-buffer).