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The Universe is full of unknowns for humanity. What’s more, even data that we know ends up being questioned and reformulated, such as: the distances between planets in the solar system. In fact, as a millennial, when I was a child I learned all the planets at once and then I had to forget about Pluto. However, a reasonably solid and most interesting piece of information is How long is a day on a planet in the Solar System?information that on Earth is approximately 24 hours (23 hours and 56 minutes, specifically). This duration is due to the average time it takes our planet to complete a rotation on its own axis, although translation has an influence. Furthermore, it has evolved historically due to the gravitational pull of the Moon. Thus, and in general terms, we can establish that to estimate this duration, factors influence its radius, its orbit and also interactions with other celestial bodies. The reality is that we are facing a non-intuitive pattern with results that defy logic. To solve the question numerically, the popular science channel The Brain Maze has a great video the most agile and visual to clear our doubts with the figures in just one minute: Now we know how much, but it is even more interesting to understand why. As a summary, there are certain general rules that are met: paradoxically the largest planets are those that rotate the fastest and those closest to the Sun have suffered the effects of gravitational tides in such a way that they have slowed down to almost a stop. Although we already told you that there are quite a few anomalies. The counterintuitive pattern for determining how long a day is The Sun and the planets of the solar system. The sizes are to scale, but the distances are not. By Edits by Pepedavila. Source image on Commons edited by Farry, credited by original uploader to “Martin Kornmesser”, and later an anonymous edit re-credited it to “zaria mayers”. – Edit of File:Planets2008.jpg by Farry., Public domain, https://commons.wikimedia.org/w/index.php?curid=20584284 Giant planets have shorter days than the Earth and in short, they spin fast because they grew fast. When the Solar System formed, these early planets accumulated gas and dust with angular momentum. The gas giants captured so much material in a short time that they were able to preserve almost all of that original angular momentum. They go without brakes and it shows: it takes Jupiter less than 10 hours to make a complete revolution on itself, despite the fact that compared to Earth, it is more than 300 times its mass and 11 times larger. With Saturn this also applies, but for Uranus and Neptune the explanation is incomplete: the ice giants also spin fast for the same reason, but their history is much more eventful, either due to collisions or disturbances in the early days. On Mercury and Venus the days become eternal. The rocky planets close to the Sun found a brake in the tides. Mercury is so close to the star that its gravity has dissipated its original rotation over time. If you were on the surface of Mercury looking at the Sun, you would see it stop, move backwards, and move forward again: it is the effect of its elliptical orbit and its slow rotation, compared to its orbital speed. In fact, even has a double dawn in some parts of the planet. Venus is also slowed down by the sun’s gravity, but it also rotates in the opposite direction. Because? Good question, for you, for me and for science in general: it remains a mystery, although there are hypotheses. A curiosity to reinforce the rarities of Venus: a day lasts longer than its own year, it takes 243 Earth days to rotate on itself and only 225 to complete its orbit around the Sun. By the way, the fact that a day on Mars and on Earth lasts practically the same is, according to science, almost certainly a coincidence. This similarity and other factors have fueled for decades the idea that Mars is the ideal candidate to host life. In Xataka | We have been deceived by the distances of the Solar System: the closest neighbor to Neptune is Mercury In Xataka | The true size of all the planets in the Solar System, explained in a clarifying video