Activity for URIZEN
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
Would there be Rayleigh scattering in an atmosphere of sulfur dioxide? Can a planet with a dense atmosphere composed mainly of sulfur dioxide have a blue sky like Earth's due to Rayleigh scattering? Or would the composition change the color of the sky? I mean, it's well known that methane is responsible for the bluish colors of the atmospheres of the icy giants of the s... (more) |
— | almost 5 years ago |
| Question | — |
What gas can replace ozone as a UV filter in a planet's atmosphere? Consider a planet with life forms, which are different than those found here on Earth, orbiting a star similar to the Sun. Such life forms don't use oxygen and, therefore, the planet's atmosphere is devoid of it. Since ozone is formed by diatomic oxygen photolysis, there is also not a ozone layer, bu... (more) |
— | almost 5 years ago |
| Question | — |
How would the strong magnetic field of a white dwarf affect humans inhabiting a planet that orbits such a star? Magnetic white dwarfs (MWD) comprise almost 2 % of all white dwarfs and they are characterized by having a strong magnetic field, whose strength varies between 1 T and 100 kT. Compared to the Earth's magnetic field, whose strength varies between 25 µT and 65 µT, the magnetic field of a MWD is betwe... (more) |
— | almost 5 years ago |
| Question | — |
How to calculate the average temperature of the hemispheres of a planet tidally locked to its star? I have a planet orbiting a red dwarf and, as expected, it is tidally locked to its star. I know that these planets will have a very significant temperature difference between the diurnal and nocturnal hemispheres, but I want to know how different it will be, that is to say, what will be the average t... (more) |
— | about 5 years ago |
| Question | — |
How to dry an ocean planet and turn it into a salty desert? I have a planet covered with a large shallow ocean, which extends over most of its surface. I want to turn this planet into a great desert, specifically a salty desert (the salts of this desert are a mixture of several chlorides, not just NaCl, there is also NH4Cl, MgCl2, CaCl2, etc.). On Earth there... (more) |
— | about 5 years ago |
| Question | — |
At what time of day does the illuminance coincide with that on my planet at noon? My planet (I'll call it $P$ for practical reasons) is 2 AU from the Sun, a distance in which it receives 25 % of the sunlight that Earth receives. This can be estimated with the Inverse Square Law: \begin{gather} E=\frac{1}{d^{2}} \end{gather} For $P$: \begin{gather} E=\frac{1}{2^{2}}=0.25 \end{ga... (more) |
— | about 5 years ago |
| Question | — |
How is the visual luminosity of a star calculated? My idea is a planet that orbits a red dwarf at a distance in which the apparent magnitude of this seen from the planet is the same as that of the sun seen from Earth. Does this mean that the daylight on the planet will be as intense as that of Earth? I know that the red dwarfs emit most of their ene... (more) |
— | about 5 years ago |
| Question | — |
How to find the density of a planet and its core taking into account the gravitational compression in them? Consider a planet $P$ of radius $r$ larger than Earth, whose mass is $r^3$. By the square"“cube law, this planet will have the same density as the Earth... assuming that the gravitational compression on it is the same as on our planet, but this is wrong, because the planet will have a greater gravity... (more) |
— | about 5 years ago |
| Question | — |
How to find the radius of a planet given its internal composition? Consider a planet very similar to Earth, with the same radius and the same mass. In a very simplified model of its interior, 70 % of its mass is magnesium silicate and the remaining 30 % is iron. This latter, being denser than the first, it will sink towards the center, forming the planetary core. C... (more) |
— | over 5 years ago |
| Question | — |
Is a carbon planet with seas of methanol on its surface scientifically possible? I am creating a carbon planet with seas of methanol on its surface, but I am not sure that this is possible. It is predicted that carbon planets are depleted of water, since the available oxygen would be depleted by reacting with carbon to mainly form simple compounds such as carbon monoxide, carbon... (more) |
— | over 5 years ago |
| Question | — |
How different would the internal composition of a carbon planet be from that of Earth? My idea is a carbon planet 50 % larger than Earth and with 5 times its mass (approximately), but I set these values "‹"‹after investigating those of several discovered exoplanets and none of them is considered a carbon planet, they are probably more similar to Earth in terms of their internal composi... (more) |
— | over 5 years ago |
| Question | — |
How to calculate the average temperature of a planet with greenhouse gases? I am creating a planet with an orange dwarf as its host star and which is at a certain distance from it in such a way that it receives 1 % of the light received by the Earth from the Sun. Obviously, without an atmosphere that has a significant amount of greenhouse gases, the average temperature would... (more) |
— | over 5 years ago |