"During the night of 21 December 2015, a weak signal was received by the Rosetta spacecraft and examined by the mission team. Their analysis revealed that this was not a transmission from the lander."

This seems like something that deserves a little more elaboration.

That got me intrigued too. Found a bit more info on it in the comments of a reddit post here: https://www.reddit.com/r/space/comments/3xtu76/comet_lander_...

Thanks. This seems to be the key relevant quote from that thread: "The RSSI telemetry showed a single value sticking out of the noise, that's it."

So, just something random. Computer glitch, cosmic ray whacking something, or similar. Not aliens, alas.

Comet landing was November 2015? Is the mission really that recent? I thought I heard about it earlier.

It's a typo, the landing occurred in Nov 2014.