I've seen quite a few worlds on this subreddit involve planets that are tidally locked with their star. I was similarly interested in tidally locked planets and wrote a research paper on their habitability a few months back. I'll be giving a run-down on what I learned in this post for anyone who likes to do some hard world building. Feel free to skip around.
I won't go over the mechanics of tidal locking, but the likelihood of tidal locking is higher for stellar bodies that are closer together. Mercury, for example, is almost tidally locked with our sun. Therefore, it is difficult to find a tidally locked planet in the habitable zone of a star the size of our sun. For the much smaller and cooler M dwarf however, planets in the habitable zone are incredibly likely to be tidally locked.
Given that only one side of... keep reading on reddit ➡
I have been doing a bit of research about the moment captured on video during the Apollo 15 moon landing when the astronaut David Scott bounced past a flag and the flag started to move. The cause of the movement is debated. A semi-official explanation on Nasa's Apollo 15 lunar surface journal is that Scott touched the flag with his elbow (see the entry at 148:57:15). The journal says that the idea he was carrying a static charge which caused the flag to move is "very unlikely" since there were no similar flag movements seen in other moon walks. However, I think Scott was too far from the flag to have touched it, as shown in this video of a 3d recreation of the scene. According to that, Scott was about a metre from the flag. So I think the movement must have been caused by static electricity.
According to this [slideshow by a NASA sc... keep reading on reddit ➡
Continued from here.
This is a work in progress.
22. Can you explain how it is possible to make a movement such as this one, this one, or this one, without some kind of external force pulling you upwards?
All of the clips shown of the astronauts apparently defying gravity are the result of the fact that on the moon there is less gravity than on Earth. The narrator himself has mentioned the fact that the moon's gravity is one sixth of the Earth, but takes no account of this fact when expressing his great perplexity at the astronaut's unnatural movements. The movements only seem unnatural if you imagine them taking place in full gravity. If you take account of the fact that they're on the moon, there is no mystery. But for the sake of completeness, yes, I can explain the movements.
>2:01:14 "This astronaut is leaning on the ground and then he suddenly gets up with no apparent effort".
He clear... keep reading on reddit ➡
I am interested to hear opinions on the possibility of humans living in a red dwarf system. I particularly search for a setting for a book with sci-fi elements. Now I am only an enthusiast, not a scientist, so perhaps someone with more insight might share?
It would also be of great help if some of you know a better suited subreddit or know of a similar discussion.
Also, English is not my mother tongue, so please bear with me.
A selection of my thoughts so far: The planet will likely be extremely close to the red dwarf and tidal locked (one side in eternal darkness). To distribute heat to the dark side of the planet, it will be necessary to have a relatively dense atmosphere and possibly big bodies of water. Besides there would be strong winds, and likely constant torrential rain at the subsolar point. There will possibly be a lot of clouds, helping in heat distribution. Years would be extremely short. The star would have to be rather old, in order to reduce the risk... keep reading on reddit ➡
I'm designing a very dry world; less than 10% of the surface is ocean. The biggest issue I'm having is balancing of heat; since land has a greater heat capacity than water, the temperature gradient between the poles and the equator is much bigger and consequently you get really strong winds which are a big problem for, well, civilisation. You'd also have a really hot equatorial region, probably too hot for humanity.
In addition, I'd like the world to only have two Hadley Cells, like Venus has, one in each hemisphere, instead of the three we have. This would make the poles drier but the equator a bit wetter, and (very importantly) would cause more cloud formation over the equator and especially the subsolar point, which would reflect some sunlight and help keep the equatorial regions a reasonable temperature.
The problem is, now I have the day-night temperature gradient huge as well.
A denser atmosphere could solve both these problems; it spreads out temperature gradients from both l... keep reading on reddit ➡
a)Describe the atmospheric flow pattern b)If the atmosphere were very humid, where might you expect rainfall? c)If the planet began rotating on an axis parallel to the line through the two suns and the planet, how (and why) might this affect the flow?
Any help is appreciated
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I'm writing about a planet tidally locked to the star it orbits. Taking liberties with the real physics involved, the sunside is more or less desert/arid and the dark side is tundra or just frozen. I'm experimenting with navigation language. Does orienting the cardinal directions to the solar poles make sense? Example, the solar north pole is the point closest to the sun. South pole is farthest. The "equator" would be the temperate zone that rings the planet.
I'm not totally married to the idea. I just want to hear if it's confusing or seems like it might take the reader out of the story to have to rethink about how the directions work.
A while ago, I posted a map of my world. I started to work specifically with the eastern portion: Pera. One thing that is important to note is that the first map is only half of the planet as it is** tidally locked towards the star**. although I"ve created my own climate map of Pera, my questions are these:
How would a planet tidally locked affect: winds or trade winds, tectonic plates and their collisions, and long term climate zones?
Regarding climates, if the side of the planet is continually facing the sun, will it change the climate zone? would their be coniferous forests in the north and would ice caps stay frozen?
How would tidal waves and the wuthering of coastlines occur, if at all?
Are there any good examples of tidally locked planets, their geography and (fictional) climates?
If at all, making a mock diagram or altering my map would be much appreciated. Thank you.
I have been doing a bit of research about the moment captured on Video during the Apollo 15 moon landing when the astronaut David Scott bounced past a flag at a distance of about 1 metre and the flag started to flutter. Some people say this could have only happened in an atmosphere, but I think that static electricity could have caused it.
In the American Moon film it's pointed out that static charges dissipate very quickly on the moon (in about half a millisecond), the source for which is this slideshow by a NASA scientist (slides 7 and 8). The reason for fast dissipation is the solar wind, which bombards the moon with electrons and protons and creates a "plasma sheath" of electrons around the moon. These ambient electrons act as a ground to any positive charge. Interestingly, though, a nega... keep reading on reddit ➡