I pressed the "recently scanned" button for sorting planets and was surprised to find my very first colonized planet in the list.

Question: Does this tool tell you that others (not just yourself) have scanned the planets in question? Because if it was only the ones I scanned, I would have expected virtually ALL of them to show up if the very first one did (and they did not). Or does it maybe show only the planets on your list that were recently scanned by others (would be very helpful if so).

Question 2: What is the time involved for "recently?" A day, a week?

I posted this a while ago and just figured out the issue. Recently scanned does not mean that. It means recently viewed planets.

If you view one of your planets, it will show up using that tab. Not sure how long it will stay there though.