Comparative astronomy has taken a new leap into the data of the Insight mission in particular Via Earthquake waves with cheese instrument detected on Mars. After Earth and the Moon, we have knowledge of the internal structure of a new rocky planet, which has a crust, a shield and a center.
International Group of Astronomers Published three articles in the magazine It shows how far we have come , The first person to begin active exploration of Mars on Earth. Unfortunately it is no longer possible to know (or comment on) the results of these articles, which suggests that we now have as complete and accurate a picture as possible of the internal structure of Mars.
Specialized astronomers (As in planetary science , The world’s microscopic system and its macroscopic system maintain strong causal links). Thus known as thickness Must have been 30 to 100 kilometers from the Red Planet. But we could not go far with other data on the deep structure of Mars, we determined that there should be a maximum of one nucleus, with a radius estimated at 1,400 to 2,000. Kilometers.And Mars geophysics has already been able to achieve some results before many other fields And the Martian landscape, relating the data in these areas to the mineral and cosmological information provided by the study
Articles published Science By Insight Collaboration , The And this In March. The first Martian crust reports several physical and chemical suspensions. As explained , First 10 km depth and Martians argue that this reflects the presence of very atmospheric rocks, resulting in a much older fluid cycle. Below, a slightly altered geological structure is 20 km. Around will be with a second pause, then a third, less marked, 35 km.
A presentation on the Insight Mission (summary of the summary), beginning in 2018 Seismic investigations, interior inspection using geodesy and heat transfer ; In French: internal study by seismic sounds, geodesy and heat flux). The video explains why astronomers want to understand the interior of Mars and why it does not have a magnetic field. © Cnes
Studies by gravity, magnetic field and seismic, inland geophysicists
A unique analysis ஆறு (, Three types , Allowing us to conclude that there is now an iron center on Mars Its radius ranges from 1,790 km to 1,870 km and contains . But, because there is nothing but one , This fluid is not in the center .Made possible by experience
On the other hand, the Seems to be absent, which causes effects on the temperature conditions of Mars’ mantle. As explained Philip Lagnonne In an article , Professor and geologist at the Paris Institute of Globe Physics (IPGP) in the field of geophysics and astronomy Cheese’s chief investigator at the Institute of Physics: “ If it had been on Mars, such a layer would have been “elevated”. Therefore , Especially in the first 500 million years. »Mars appears to have a single mineral crust similar to the Earth’s crust. But the analog of the lower mandible dominates
We come to these conclusions especially trying to stick with thousands of observationsIt’s like searching for the exact characteristics of a musical instrument, the Martian shield and center, depending on many adjustable parameters, like comparing the sound produced by an entire family and listening to it without looking at it. This is called An inverse problem in terms of Mathematicians.
Let’s clarify all this a little bit.
Like our Blue Planet, there was a revolution in determining the internal structure of Mars He was interested in determining the origin of the planets, so he used the Earth as the only laboratory of its time, to unravel the mystery of its universe, which would lead to a situation where seismic science would be hard to prove. .. Only at the beginning of the 20th century can we have a moving mindset for the pioneers of this science.e Century, by placing its theoretical and practical sites with mechanical and electro-mechanical seismic measurements made possible the study of rocky planets in general, but also of such stars. , Via Asteroid. Already at that time, they say they are smart
In both Earth and Mars, astronomers were initially able to rely on field research to determine their internal structures.These planets and their rotational movements, which continue today in conjunction with the study of seismic waves.
DistributionBecause the planets differ in density, the gravitational field must be internally outside the planets, thus making measurements Precise movements on the surface, and especially in studies The gravitational field created by these passes through valleys and bumps of symmetrical surfaces , Made it possible to form ideas about what the surfaces of the Earth and Mars already obscure.
In the case Get up (Rotation and interior structure testing) Which provided pressures at the center of the planet., Here it is And this The axis of the Mars cycle used thanks to the tool
The Mars International Space Mission, Insight, piloted by the US space agency (NASA), departed in May 2018 from the Vandenberg base in California. Seven faculty-researchers and researchers from the Nandas Planetary and Geodynamics Laboratory (LPG – Nandus University – Anger University – CNRS) are participating in this work, one of whose objectives is to estimate the seismicity of Mars and the different layers that make up the Red Planet. Look back at the history of the work, its obstacles and scientific challenges. The documentary was co-produced by Nantes, Audiovisual and Multimedia Pole of Guinness University, and the Institute de Physique to Globe de Paris, and describes how the exploration of Mars is possible with Insight tools. © UnivNantes
Cheese, an exceptional seismometer
Today, more than 600 Martian earthquakes have been recorded and analyzed by an international team Tuesday Hand deposit Insight into the surface of Mars, a distant relative of seismic measurements once made .Service (MQS) of Insight Mission, they were chatting. Seismic data are monitored daily for one Mars year (approximately two Earth years)
On Earth, there are thousands of stations to measure seismic waves, their types, arrival time,Is relevant, so it can be used to detect the sources of seismic waves Go to the nature and distribution of rocks into the earth. In fact, depending on the nature of the rocks and their temperature conditions , Types of waves, their Travel times are not the same.
In the case of Mars, there is only one station for recording seismic waves, and it is on the surface, unlike on Earth, where they are buried, so they recede from activity.. Although Mars is weak and the seismic noise of Mars is just that, it is necessary to efficiently filter the recorded signals to consider only those that can speak inside Mars.
As Eric Beckler explains in the video below (6:50), cheese actually has three major seismic measurements. This makes it possible to reverse the direction of origin of particularly measured seismic waves. After all, astronomers have used transitions between different types of waves and their different frequencies and phase changes, whether they propagate on the surface or are reflected by inner layers, as they appear during arrival periods. Single Earthquake to illuminate the internal structure of Mars (see descriptions and graphics in addition to video ).
On November 26, 2018, the Insight module landed on Mars soil. The main goal of this NASA mission is to install seismometers to record the vibrations of the Red Planet. The surface of Mars is well known, thanks to satellites, with very little data in the deep interior; Insight is a mission that firmly returns to the interior of the planet. Advanced explanations from Eric Fugler, a professor at the University of Nantes University’s Laboratory of Geology and Geodynamics (LPG). © UnivNantes
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