There is something vaguely sinister about this image from Astronomy Picture of the Day. Vast and backlit it glides through the black immensity of space as it has for eons, its shape vaguely suggestive of an ancient, battered ship. If anything is suggestive of the ever popular killer asteroid, this is it.
In fact it is a moon of Saturn, the 'shepherd moon' Prometheus, which along with Pandora governs the behavior of the F ring at the outer edge of Saturn's main ring system. I'll say again that the ancients blew it with Saturn: It should have been Juno, queen of the Solar System with her royal tiara. Far from sinister, Prometheus and his (astronomical if not mythological) sister merely help keep the royal jewels in place.
Over the last week or two, a couple of blog readers have emailed me asking for 'technical consulting' assistance in working out settings for hard SF or rocketpunk stories. I had to turn them down, because I hate making promises unless I'm sure I can really follow through.
On the other hand I'd be delighted to take part, and the hive mind of commenters has a lot of knowledge, far more than I do. So I am inclined to provide some comment threads for those discussions, starting with this one. (I also highly recommend SFConsim-l.) If there turns out to be enough demand, a companion forum could be set up for hard SF worldbuilding discussion.
Otherwise, regard this as an open thread. My own online presence will be minimal for a few days, but I'll try to drop by and say hello.