Originally Posted by Antarctica!

Risu smiled gently, not in the least fazed by Davina's protest. "I do teach Astronomy," he said, still reading the encyclopaedia entry on Jarnsaxa. "And I'm sure my knowledge is broad enough to tackle any questions that might come up in class. Or, if not, know where to look." He poked the book. "Like now." He turned to the next page. "But my own scientific training and research lie more in the area of cosmology. I feel confident speaking about what I know there. But I could not, for example, tell you the exact position of a small moon such as Jarnsaxa. Or its composition." He waved a hand. "And so on and so forth. The Universe is a big place, as I'm sure you can appreciate, and no one can try to keep all of it in a single head."

There was a lot of interesting stuff about Jarnsaxa in this book, though. Risu had always been more interested in objects starting at the size of, say, star (up to the entire cosmos itself), and planets and moons had always been off to the side.

He tapped a slender finger against the page. "Unfortunately, I fear I have to disappoint you yet again. This will tell you all about the astronomical object Jarnsaxa, and the origin of its name, but nothing about, er... genealogy, which seems to be what you are looking for." He inserted a pencil into the page as an improvised bookmark and closed it. Looking at Davina, Risu continued, "I am personally unaware of anyone by that last name as well... I would say that anyone having that name would most likely trace it back to Norse mythology rather than a fairly obscure moon of Saturn."