I Googled it, and found a couple of Joomla extensions, JoomRSS, Feed2Post, and RSSFactory.
They all seem pretty much the same, they do allow RSS feeds to be displayed as "active articles" in Joomla. But, the content of the feeds is only 1 or 2 lines maximum, with a link to the original source website, which is very dissapointing. Maybe that is just the way an RSS feed is? Do you know, because Im not sure.
I was hoping for full several paragraphs plus photos "active RSS news content".