Activity for Luís Henrique‭

Type	On...	Excerpt	Status	Date
Question	—	Moon orbit perpendicular to planet orbit - possible? (edited to fix obvious confusion, as detected by AlexP) The idea is that the plane of the moon orbit is aproximately at a 90 degree angle to the plane of the planet orbit. Would that be stable, or even possible? Supposing size, mass, distance, axial tilt, rotational period, similar to the Earth-Mo... (more)	—	over 7 years ago
Question	—	Can there be a planet for which orbit and precession take the same time? Is there a necessary relation between orbital period and the time of precession? In the case of Earth, the orbital period is one year, while a complete precession cycle takes thousands of years. Is a planet that completes a precession cycle within one of its "years" possible? Besides one of the poles... (more)	—	almost 8 years ago
Question	—	What made silphium difficult to domesticate? I am trying my hand at a matriarchal society (human beings, technology similar to Earth's 13th - 16th century), and I find that for that to work they will need reasonably efficient contraceptives (and abortives as a backup, of course). In pre-industrial Earth, that role was fulfilled by a now-extinc... (more)	—	over 8 years ago
Question	—	Would armour made of spider silk work? Would it be possible to use spider silk for armour, instead of metal? I am not worried about how to obtain the silk. I know that spiders are not domesticable and that they are too aggressive to each others so that they cannot be lumped together like bees. (I can handwave all that; my spiders are jus... (more)	—	over 8 years ago