Celestia Forums

Brina1, I think perhaps you are thinking about the accelerations of the stars -- how the directions of their motions are changing with time. Those are indeed harder to measure in many cases. that is kinda what I was getting at... only I didn't know that any measurements of the movement of the stars...

one thing that always puzzled me... exactly what illuminates nebulae? I know it's stars, but we're talking about gas clouds that I believe (not sure) sometimes reach several lightyears in diameter, and yet they're always iluminated so brightly all around... I mean, there's a nebula that Sol's locate...

It's really too bad that the pioneer probes weren't fitted with even the most basic of hobbiest level telescopes... They're so far out from either side of the sun totally opposite eachother that if they had telescopes we could use them to get a better idea about how nebulas look in three dimensions ...

Um, "in space nobody can hear you scream"? I suppose you might be able to hear something in a nebula, if it's thick enough... Just how thick are nebulas anyway?

we barely know at all their speeds and directions... To do that we'd basically have to know their exact masses and simulate it using simulated gravity. Probably Newtonian gravity since we're not dealing with the warping of space as in Einstein's theories which somewhat contradict Newton. You have an...

Before you flame me, let me just say I'm perfectly aware that neither Nibiru nor Planet-X exist. I only suggest this as humor, don't take it seriously... According to all sorts of sources about Planet Nibiru aka Planet-X, it's supposed to be on a 3600 year orbit. There's also any number of sizes cla...