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Your Dragons communicate largely using infrasound as a means to transmit across long distances. Similarly to Elephants, Hippopotamuses, Rhinoceroses, and even Alligators, these organisms find util...
Your dragons are self-sustaining MIDIs and synthesizers. They sound like a slightly artificial version of any noise on the planet. All human languages, the output of all instruments, all birds, ...
Traveling outwards from the Earth in plastic bags in a tube, it would survive minutes, 'till the bags heated up in the solar radiation, burst and the whole of the inside of the tube was filled with...
Blood is not the best substance here. Most of the tests for genetic genealogy and genetic medical testing use saliva or epithelial inner cheek cells. Saliva officially lasts for about a year if p...
How long a human being could live with stem cells? Science-based and the science-fiction tag, hmm. If the science is right and with some restrictions, perhaps forever barring physical assault...
Pumice is composed of highly microvesicular glass pyroclastic with very thin, translucent bubble walls of extrusive igneous rock...It forms when volcanic gases exsolving from viscous magma f...
You want to know how close your planet would get to a supermassive black hole. The Planet wouldn't get near the black hole itself. Not even near the Roche Limit. And I'll prove it. The vicinity...
LEDs LEDs are currently the most energy efficient readily available lighting system. Better things may come along, but the reason you read about fluorescent light bulbs in older novels is because ...
Cells are semi-psychic Each cell emits a small psychic aura, which is strengthened by the cells around it. This aura operates outside the realm of physics (On another plane of existence, perhaps?)...
Let's look at two key equations: $$F_i=\frac{L_i}{4\pi r_i^2},\quad \lambda_{\text{max,i}}=\frac{b}{T_i},\tag{1, 2}$$ For a given star with luminosity $L_i$ and surface temperature $T_i$ a distance...
Since you say in a comment that you're willing to settle for a combination of tamper-evident and write-only unless tampered with, as opposed to strictly tamper-proof (which indeed is a much harder ...
There are a few things that you'd need to be able to clone a creature. One thing is a sample of intact DNA. If stem cells can be acquired to get it this would be better, as mature cells are specia...
A plausible reason for the negative correlation between anthropoid muzzle size and brain size is quite simple, the higher the intelligence, particularly if high enough to cook, the less need there ...
TL;DR There are several important factors considered when trying to determine if a group of stars are actually from the same stellar cluster, moving group, or association: Kinematics. Do the sta...
This would not naturally work the way that you describe. Saturn has rings because the ice and rocks that make it orbit the mass of the planet. Without that mass, say if Saturn were to fall into a ...
TL;DR Your world will experience constant, uniform gravity. Everything is accelerating upward at the same rate - but this isn't the case in our universe, as gravity follows (approximately) an inve...
Galaxy size The first question is whether such a galaxy (less than 3000 stars) is possible. The clear answer is yes; Segue II already satisfies those requirements. Segue I and Willman I appear qui...
I don't think you are thinking about thoughts correctly. I am an AI researcher, familiar with the field. It is provably true that the human brain uses sensory information to discern patterns; about...
Mass The big issue here lies in determining the mass of these black holes. On the one hand, the traditional primordial black holes you mention - formed by density perturbations - occupy a relative...
Yes, there is a habitable zone. Known examples of possibly-habitable binaries I have to disagree with StephenG's answer; we have data that indicates that this is possible for similar, Sun-like st...
Best use of available light Caves are naturally dark. But sometimes there is a little light - either reflected from the entrance to the back of the cave, phosphorescent minerals, or perhaps artifi...
As far as you like, the calendar is not that important. It also depends on what counts as a calendar! The reason the constellations tend to not look anything like a description of their names, w...
A swiss cheese-style dark nebula Celestial navigation requires seeing other objects in the sky. But you can't do much of that if you can't see many celestial bodies. Therefore, you need to place y...
My first thought was that the saying that we're "99.999% empty space" would easily solve this problem. The atoms would just push each other around a bit, and the parts that intersected the wall wou...
The time it takes a moon to become tidally locked to a planet depends on a number of factors. In particular, $$t_{\text{lock}}\propto\frac{\omega a^6}{m_p^{2}}$$ where $\omega$ is the moon's initia...
