Computers On Germans and Israelis they dedicated 100 Shavuot to calculate astronomical numbers in a simulation that simulated the processes that created the moon and also discovered why the earth only has one moon today
The Moon is the only natural satellite of the Earth. Its formation raises many questions in the study of astrophysics - The moon may not have been alone in the early Earth's sky. Recent studies indicate that there were several small moons - the so-called monthly - But we don't know what happened to them.
A joint study, by D"R. Uri Malamud and Prof' Hagai Peretz from the Faculty of Physics at the Technion, Dr. Christoph Schaffer from the University of Tübingen and Christoph Burger of the University of Vienna, designed to investigate what happened to the Earth's moons. The researchers' complex simulations suggested that they may have fallen to Earth in collisions that changed the composition of the Earth's mantle. Their research was published in the latest issue of the journal Monthly Notices of the Royal Astronomical Society.
According to the currently accepted theory, The moon was formed approx-4.5 A billion years in the collision between the ancient Earth and another planet the size of Mars. Astrophysicists call this planet Thea (Thea). This event led to the formation of a disc around the Earth, consisting of material ejected from both bodies due to the collision. The material in the disk eventually accreted into the moon we know today. But a recent study indicates that the Earth did not go through just one collision, but a number of large collisions, and that smaller bodies hit the Earth even more often. These processes led to the formation of several magazines, that the researchers assume that the mass of each of them was between one-sixth and one-half of the mass of the moon.
"There are three options: It is possible that some of the bodies merged due to gravity and created larger objects (and at the end of the process the current moon) , Some were removed from the Earth's gravitational influence due to mutual interactions, and some fell to the Earth and collided with it," explains astrophysicist Dr. Christoph Schaffer. "The last possibility is the one we mainly focus on in the present study".
To simulate the collisions of the moons with the Earth, The researchers used a developed computer program, Under the guidance of Dr. Christoph Shaffer, by the working group of Prof' Wilhelm Klee at the Tübingen Institute for Astronomy and Astrophysics. The calculations themselves were conducted in the Tibingen computer cluster BinAC And in an octopus cluster in Israel. The software of the physicists from Tübingen made use of hydrodynamic simulations to create a model of the processes, and in graphic processing units to speed up the complex calculation processes. Christoph Burger of the Institute for Astronomy and Astrophysics at the University of Vienna wrote the code for the complex and initial conditions for the simulations.
Calculation time of 100 Weeks
The astrophysicists postulated a simplified model of the primordial Earth and a falling moon - where both had an iron core and a silicate shell, according to a mass ratio similar to that which exists today. The group performed more than-70 Simulations of a lunar collision with the Earth, with different variables such as the angle of impact, The size of the moon and the speed of the earth's rotation. "Overall, The calculations required a calculation time of more than-100 Weeks,says Dr. Uri Malmud.
Dr. Uri Malmud from the Technion analyzed the results of the simulations. He determined which fragments of the bodies could have left the system, These fragments could enter orbit around the Earth, And these were left after they hit the Earth. He also calculated the change in the Earth's rotation time caused by the collision. "Our results show that when a moon hits the Earth, The material added to the system is not homogeneously dispersed. This type of collision may, therefore, lead to asymmetry and inhomogeneity in the composition of the Earth's mantle,says Dr. Malmud. This joint research gives us a more complete picture of how the Moon was formed and places it in the wider context of the formation of the planets in the Solar System.
For the full article b- Monthly Notices of the Royal Astronomical Society
More of the topic in Hayadan:
8 תגובות
Before life developed in Israel
There was an awakening out of which a trend was created - a certain legality -
From the distance of time from creation, a few more thoughts will pass until we lose height and disappear from the universe.
Until then we will explore, discover, plant and try again maybe even share ours with those who don't have them (in my opinion they are too close to the source and their mass did not create a stable enough axis of attraction to capture moon/s with it)
Yehuda
In small planets - the formation of a moon is a rare event. Note something: in the inner planets the number of moons depends approximately on the distance from the sun: Mercury - 0, Venus - 0, Earth - 1, Mars - 2. After that there are more moons - even Pluto has 5. So - there is nothing unusual in that Venus today has no moon.
I said earlier - you need a very, very serious reason to say that something is flawed in the assumptions of experts in the field - I don't see that you have such a reason.
I don't think that as a pilot he decides not to take off at a certain airport - say his assumptions are flawed (neither am I, even though I have thousands of flight hours). I also don't think you will argue with the surgeon how much anesthetic to inject you with. And you won't argue with the Ministry of Health about which vaccines to give the child (I hope!).
Can you say what is wrong with the researcher's assumptions, and explain why it is wrong?
Philosophically - I don't understand at all how you can ask "Why does Venus not have a moon?". There is no single reason why the planet has moons. To answer your question - you need to know (a) all the reasons for the formation of moons and (b) why none of these reasons existed for Venus.
Our moon is moving away from us - so maybe Venus had a moon that moved away and we don't recognize it as a Venusian moon?
Maybe we had two moons and one moved away?
So why exactly are you asking your question? And how is it related to the topic of the article?
for miracles
Again, because Venus is very similar to the Earth and therefore the reasons that caused the Earth to receive a moon gift should have allowed a moon to Venus as well and if this did not happen then something is flawed in the assumptions listed in the article
That's my opinion
good week
Yehuda
Yehuda
Planet Mercury has no moons
Venus has no moons
Land of one moon
Mars 2
Jupiter 67
Saturn 62
Uranus 27
Neptune 14
Pluto 5
Aris 1
Homia 2
Orcus 1
Quor 1
Now explain to me - why are you asking specifically about Venus? Is Venus unusually different from the other planets?
Yehuda - No one knows what happened 200 years ago. What's more, we have a very high probability that certain events happened in the past.
There seems to be a direct relationship between the size of the event and confidence in knowledge, and an inverse relationship between time (and/or distance) and confidence in knowledge.
When researchers say they think something happened, you need a really good reason not to accept their opinion. Feeling it's not enough.
Miracles
So what if Venus rotates in a strange way, that's why it doesn't deserve a moon??, even Uranus that rotates on its side has 27 moons and 11 more rings, Venus has nothing, nada?
Therefore the explanation about our moon has a lot of uncertainty.
There is no good reason why Venus should not have moons.
So Shalom and blessed Shabbat
And don't forget to pray for our precious white blessing
And the inhabitants of Venus will die of envy!
Yehuda
Yehuda
You ask a strange question. Why does Venus have no moon? Venus rotates upside down and has a very long day - about six months! So Venus is very unusual, so that it has no moon should not be surprising.
These computer clusters are sometimes archaic. One graphics accelerator costing NIS 4500 produces the computing power of 8000 regular processors. There are spawns that include expansion up to 20 cards. That is equivalent to 160000 processors. Here is a cluster on one server
Let's assume that this was exactly the story of our moon, the question arises: - After all, the Earth has a neighbor, Venus, which is almost the same size as the Earth, why does Venus not have a moon??
I have a feeling that the uncertainty in the above research is great and after about four billion years there can be many possibilities for formation and no one can really know what really happened.
Please respond gently
Good Day
Yehuda