« on: 21/01/2023 00:11:08 »
I've forgotten how to post images (I'm getting old )It looks like the death star:
"That's no moon. Oh wait, it's a moon"
I would say that it looks like it covers about 25% of the diameter of the MimasClose enough. I get 30% of the diameter, or about 10% of the circumference, which makes it cover maybe 3% of the surface, a slight reduction of my prior estimate.
... as seen from Saturn.Although most images including the one I posted are not from Saturn. Most are as seen from Earth, as evidenced by the fact that we see most of the daylight side.
Probably much smaller than the diameter of the impact crater of our dinosaur killing asteroid ...?The Mimas crater is about 130 km across, whereas the Chicxulub crater (Yucatan) is about 150 km across, larger, but not much larger. It's the second largest crater on Earth, with Vredefort being a bit bigger, in South Africa.
There's no trace of the Theia impact structure since that was a melt-the-whole-thing-and-start-over sort of deal. It would not be meaningful to say 'here's the spot where it hit'.
But how come the Search Information says Confirmed vs Provisional?The provisional ones have not had their sightings or orbits yet confirmed. They might just be a passing object and not in orbit at all.
So WE still aren't Sure how many exact Moons they have?No, they're really far away and it's awful dark out there, and some of these things are pretty tiny. There must be a threshold of what constitutes a moon vs just a small pebble that happens to be in orbit about something.
Juno & Voyager did take a closer look, Right?Yes, and they found/confirmed a bunch, but the didn't linger long enough to do a thorough scan of the area. Juno didn't make it to Saturn either.
Thanx Hal for setting me straight...Again!OK, so setting you even more straight, I'm Halc (rhymes with 'false'). There is another user (occasional poster) on this site whose ID is Hal. I'm not him.
Roger Penrose imagined a Cyclical Universe, isn't it? So why'd he do dat?Try something different? Hard to say what he suggests, but it seems like it is playing with conformal time. The view requires infinite time to pass as measured by one bang before the next one happens, and it is unclear if it allows the bang to have any energy associated with it. The bangs still happen everywhere, which is the same as nowhere given infinite time and spacetime becomes singular in a way.
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