Recent content by yotta

I was saying that the observed red-shifted photon flux would be much higher than it should be, given the color temperature of the observed light, and what the black-body photon flux emission should be at the temperature. A more extreme case would be even more red-shifting, say from 20,000 K to...

Main Question or Discussion Point Is red-shifted light brighter than what its black-body emission would be at the same temperature? As a figurative example, a star, neutron star, or other astronomical body has a temperature of 6,000 K, and is so close to its Schwarzschild radius that its light...

Of course, we haven't been to black holes physically, but we have observed them, even if only akin to telescopes that made it look as if Mars had canals. Here are two articles about supercomputer simulations we've run of them: https://www.space.com/43151-how-particles-escape-black-holes.html...

I see you're talking general relativity, when I was talking Newtonian physics. I meant "acceleration of gravity" in the same way as dropping a ball from a height. In freefall, the ball is accelerating, but does not feel it because gravity is pulling in the opposite direction, so the forces...

Main Question or Discussion Point Wouldn't the definition of the event horizon of a black hole be the radius at which the acceleration of gravity exceeds the speed of light, instead of the radius at which the escape velocity exceeds the speed of light?It's very clear to me that a...

I didn't know trademarks were anywhere nearly that complicated, so I'm not going to want to go through that much trouble. Good advice, that a challenge in a story need not be nearly as dark as almost all Hollywood movies have been in recent years. Good stories usually require an action to be...

I like the idea of "hybrid" hard and soft sci-fi, as in everything physical obeys the laws of physics, or nearly so, but then there can be ESP, astral travel, etc., but not reincarnation, since that infringes too much on religion; as if the godlike abilities of some alien species weren't...

I didn't say I'm writing an entire novel for the sole purpose, or even main purpose, of establishing a precedent, nor the I'd consider myself to have sole copyright ownership of the idea of an udQM very dense body. Perhaps I wasn't entirely clear, I'm writing about it for now, as background for...

Even the Moon is huge next to the tiny bodies I'm talking about, so I'm not altogether clear that escape velocity and the ability to hold an atmosphere are as straightforward in my case. I've done a few very simple calculations of what the gravitational strength would be at various altitudes...

Sounds like a very interesting book, especially given that the reviews were all over the map. I'm a slow reader, so wouldn't want to take on one of his trilogies. I'm getting a used copy, so I'll get to see how he handles the physics and world building.

Because the concept of udQM planetoids is clearly not copyright-able, without a story to go with it, others might use it, too. This is clearly background, which I'd like to get right. This could be a precedent in sci-fi, a smaller thing than the Dyson Sphere. I'm really curious about the...

Actually, I had in mind a rogue planetoid version, as well, with somewhat lower gravity, hundreds or even thousands of levels of living areas, an outer atmosphere to protect the shell surface from small objects, and the ability to deflect large objects. For really large objects, the planetoid...

Main Question or Discussion Point: How small can an astronomical body be with 1.6 Earth gravity, and still hold an argon-oxygen atmosphere? I have an idea for the use of up-down quark matter, (udQM) as described in the theory of the "continent of stability" in atomic physics, to create...

There's one possibility about that, sending the whole star system into the void, which is particularly interesting to me. The sky would look totally black, and they probably wouldn't have thought to build telescopes to find something they had no idea was even there. They'd think their star...

I see I wasn't entirely clear, and hadn't thought about my meaning being misread. Rereading my post, I can see it. I didn't mean a close second in magnitude, I meant a close second in choice. Thorium-232 might have been a somewhat close third choice, but it's nearly three orders of magnitude...