"Oh of course! I recall that two probes were launched about a year apart with messages to any extraterrestrials that might happen across them. Ten and Eleven, I think. Eleven must be your little sibling? You still have the plague?"

If deep space mission devices could be said to have siblings. The Doctor was certainly of the opinion that they could, but he was so excited by meeting history up close like this he was off like a firework, rounding Ten and looking to each strut until he found the right one with the plague. It must have been hit with a little space dust along its way as it was just a little worn and it had a small dent near one of the corners but it was brilliant. Still perfectly easy to read after all these years!

"How clever really! Sending a family engraving and a star chart as well. I always wondered why the hydrogen. You can find that almost anywhere. Common ground I suppose."