What Is the Only Planet to Spin Clockwise?
Podcaster: Avivah Yamani
Title: Why Do Venus and Uranus Spin The Wrong Way?
Organisation: 365 Days Of Astronomy ; langitselatan
Link : http://cosmoquest.org/x/365daysofastronomy; http://langitselatan.com
Source for this podcast:
Mengapa Rotasi Venus dan Uranus Berbeda?: http://langitselatan.com/2012/07/18/mengapa-rotasi-venus-uranus-berbeda/
Rotation Of Venus: http://www.universetoday.com/36687/rotation-of-venus/
Why Venus Spins the Wrong Way : http://www.scientificamerican.com/article/why-venus-spins-the-wrong/
Description: The question is why do Venus and Uranus rotate differently from all the others?
Bio: Avivah is a project director of 365 Days Of Astronomy and astronomy communicator from Indonesia.
Today'due south sponsor: This episode of "365 Days of Astronomy" is sponsored past — no 1. We notwithstanding need sponsors for many days in 2015, and so please consider sponsoring a day or two. Just click on the "Donate" push on the lower left side of this webpage, or contact us at signup@365daysofastronomy.org.
Transcript:
Venus, the second planet in Solar System and our neighbour, is also a twin of our blueish planet. It has a like size, mass, density and chemical limerick. Only of course but like any twin, at that place is always a difference betwixt them. In this case, Venus' high temperature and farthermost pressure make it wait very different from our earth. How could you alive in a such hot planet similar that?
And not simply that. The mean solar day on Venus is much longer than 1 on the Globe. It takes 243 Earth days to consummate its rotation but it merely takes 224.7 days to complete each orbit. It means you already are in another twelvemonth once the planet finishes the day. On summit of it, Venus rotation is opposite to the Earth. It rotates backwards compared to the Globe and the other planets.
Well non all, since Uranus too rotates in a different way. If yous look at the solar system from its north pole, then you will run into all the planets orbiting the Sun counter clockwise and rotating on their axis counterclockwise, except for Venus and Uranus. Venus rotates clockwise while Uranus rolls on its side as it orbits the Sun.
The question is why do they rotate differently from all the others?
Let'due south have ourselves traveling into the past. Well non literally going to the past, merely permit'southward explore the time when all the planets formed. At that time, all the planets rotated in the same management. Simply something came along that changed the rotational management of Venus and Uranus.
Lets start with Venus. There are a few possibilities that we tin can take into business relationship to explicate why Venus rotates backwards. Venus is initially rotating counterclockwise like the other planets and it still does. In other words, it spins in the same management information technology always has, only upside down, and so that looking at it from the other planets makes the spin wait backward. As I said before, there are a few explanations for this.
Scientists have argued that the sun'due south gravitational pull on the planet'southward very dense atmosphere could accept caused strong atmospheric tides. Such potent tides could accept acquired the flip to happen.
Another explanation comes from the cratering evidence on each planet. Soon after the planets were formed, there still were many big and small-scale objects or peradventure we can classify them as mini planets that orbited the Sun. So.. this interaction with all the planets eventually cleared each planet's orbit as we know now. This is what happened to the Earth/Moon system when a Mars-sized body collided with the Earth and the leftover material merged and formed the Moon.
And Venus may have experienced an encounter with one of these larger bodies in a gigantic impact in which, unlike the Globe, the extra material didn't class a separate moon, but stopped and fifty-fifty reversed its rotation altogether.
Another simulation was fabricated by Alex Alemi and David Stevenson from California Institute of Applied science, to trace the oddness of Venus's orbit. They proposed 2 large impacts in Venus's history. The first impact's result was a satellite for Venus merely afterward 10 meg years Venus encountered another gigantic bear upon on the reverse side of the planet from the commencement bear upon which reversed its rotation and the satellite it once had spiralled in and collided with the planet itself.
That's Venus. As for Uranus, it'due south quite unique since it's not rotating in the regular clockwise or counterclockwise direction. Well if Venus was rotating upside down so.. someone must have kicked this planet and made it roll on its side. Nigh planetary axes are perpendicular to the orbital airplane. But Uranus'due south axis is extremely tilted to 97.7ยบ and its pole is pointed toward the equatorial plane of the other planets.
This farthermost tilt leads to the radical seasons that the planet experiences and makes the planet have unusual days at the poles. At the equator, Uranus experiences normal days and nights. But considering it rotates on its side, at whatsoever given time ane pole or the other is pointed more than or less towards the Sunday. This results in 1 pole experiencing 42 World years of twenty-four hours followed past 42 years of nighttime. When the Due north Pole is toward the Dominicus, the South Pole is in darkness and vice-versa.
And so how could this accept happened? Same as with Venus, Uranus too had counterclockwise rotation until a gigantic impact changed everything. The explanation for this is that in its formation history, Uranus collided with an Earth-sized object which atomic number 82 to the change of its rotation.
Another theory and simulation without collision past Gwenael Boue and Jacques Laskar from Paris Observatory shows that Uranus had very big moon with 0,1 % of Uranus's mass. The gravitational interaction between the two changed Uranus'south axis to tilt the way it is now. And for the moon itself, information technology was ejected from the organization when they encountered other massive planets.
Give thanks you for listening. This is 365 Days Of Astronomy
End of podcast:
365 Days of Astronomy
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Source: https://cosmoquest.org/x/365daysofastronomy/2015/04/30/apr-30th-why-do-venus-and-uranus-spin-the-wrong-way/
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