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WEEZYTECH - The Latest in Technology, Science, Culture, and Business > Blog > TECHNOLOGY > The space telescope surveying the entire universe to understand dark matter and dark energy
TECHNOLOGY

The space telescope surveying the entire universe to understand dark matter and dark energy

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Last updated: 2023/07/04 at 10:58
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This weekend noticed the launch of the European House Company (ESA)’s Euclid mission: an area telescope which goals to uncover the mysteries of darkish matter and darkish vitality. The two.2 ton spacecraft with its 1.2 meter telescope was carried into area by a SpaceX Falcon 9 rocket and is now on its technique to its orbit across the solar.

The mission had initially been slated to launch utilizing a Russian Soyuz rocket from Europe’s spaceport in French Guiana, however following Russia’s invasion of Ukraine cooperation between ESA and Russia was halted. So as a substitute, the telescope launched from Cape Canaveral House Pressure Station in Florida, lifting off at 12:11AM ET on Saturday July 1st. 

The telescope is headed for an orbit known as L2, the second Lagrange level, which is identical orbit utilized by the James Webb House Telescope and different area telescopes. This orbit presents excessive stability which is especially essential for a mission like Euclid which goals to gather extraordinarily detailed observations of the universe. 

Euclid ought to arrive at L2 inside 4 weeks, then conduct two months of preparations earlier than starting science observations across the starting of October.

a:hover]:text-gray-63 [&>a:hover]:shadow-underline-black darkish:[&>a:hover]:text-gray-bd darkish:[&>a:hover]:shadow-underline-gray [&>a]:shadow-underline-gray-63 darkish:[&>a]:text-gray-bd darkish:[&>a]:shadow-underline-gray »>Picture: ESA

Euclid will carry out each huge and deep surveys of the universe, stitching collectively photos to create a map of the universe to assist find out about two mysterious ideas: darkish matter, which makes up round 27 p.c of every part which exists, and darkish vitality, which accounts for round 68 p.c of the universe. Each atom, molecule, and piece of matter that we are able to observe makes up the tiny remaining 5 p.c generally known as strange or baryonic matter.

The telescope is headed for a similar orbit utilized by the James Webb House Telescope

We all know that darkish matter and darkish vitality should exist due to the actions of galaxies and the way in which that the universe expands. Nevertheless, they’re extraordinarily troublesome to check as a result of darkish matter doesn’t work together with mild and darkish vitality is an unknown type of vitality. So to search out proof of them, we have to look on a really massive scale.

“If you wish to do cosmology and observe the cosmos as a complete, it’s essential to take a giant survey,” defined Giuseppe Racca, Euclid Undertaking Supervisor at ESA in a press briefing. “And Euclid is specifically designed with a really huge angle telescope to cowl many of the universe that may be noticed in a really brief time.”

a:hover]:text-gray-63 [&>a:hover]:shadow-underline-black darkish:[&>a:hover]:text-gray-bd darkish:[&>a:hover]:shadow-underline-gray [&>a]:shadow-underline-gray-63 darkish:[&>a]:text-gray-bd darkish:[&>a]:shadow-underline-gray »>Picture: ESA

The Euclid telescope will survey 36 p.c of the sky over its six yr mission, and to watch an space that giant the telescope has a really huge discipline of view. This refers back to the quantity of the sky which might be noticed by the telescope, and in Euclid’s case the sphere of view is 2.5 occasions the dimensions of the moon. 

Evaluate that to, say, the Hubble House Telescope, which has a discipline of view that’s simply 1/twelfth the dimensions of the moon. Hubble can picture objects like galaxies or nebulae in nice element, however it might take Hubble round 1,000 years to survey a comparable space of the sky to Euclid.

We all know that darkish matter and darkish vitality should exist due to the actions of galaxies and the way in which that the universe expands

And for those who’re questioning why Euclid will solely be surveying simply over a 3rd of the sky, it’s as a result of it’s unattainable to see distant galaxies in different areas of the sky, as a result of these distant objects are blocked by nearer stars and dirt inside our personal galaxy.

Euclid can have two devices: the VISible instrument or VIS, which operates within the seen mild wavelength, and the Close to-Infrared Spectrometer and Photometer or NISP, which operates within the near-infrared. Having each these wavelengths lined permits researchers to see galaxies that are redshifted, which means that as a result of they’re transferring away from us the sunshine coming from them is shifted towards the pink finish of the spectrum. 

By combining observations from each devices, Euclid observations can be utilized to create a 3D map exhibiting the distribution of the seen matter within the universe.

However darkish matter isn’t seen — that’s why it’s so laborious to check. It might’t be noticed straight, however its presence might be inferred by trying on the distribution of the matter we are able to see. 

a:hover]:text-gray-63 [&>a:hover]:shadow-underline-black darkish:[&>a:hover]:text-gray-bd darkish:[&>a:hover]:shadow-underline-gray [&>a]:shadow-underline-gray-63 darkish:[&>a]:text-gray-bd darkish:[&>a]:shadow-underline-gray »>Picture: ESA

“Darkish vitality and darkish matter reveal themselves by the very delicate modifications they make to the looks of objects within the seen universe,” René Laureijs, Euclid Undertaking Scientist, defined. 

The 2 foremost strategies for finding out darkish vitality and darkish matter utilized by Euclid will likely be weak lensing and galaxy clustering. Utilizing two strategies for inspecting the identical factor permits the researchers to test their outcomes towards one another, hopefully leading to extra correct findings.

Gravitational lensing is an impact through which the gravity of very massive objects like galaxies or galaxy clusters warps spacetime, appearing like a magnifying glass and altering the sunshine coming from distant objects behind the foreground object. 

a:hover]:text-gray-63 [&>a:hover]:shadow-underline-black darkish:[&>a:hover]:text-gray-bd darkish:[&>a:hover]:shadow-underline-gray [&>a]:shadow-underline-gray-63 darkish:[&>a]:text-gray-bd darkish:[&>a]:shadow-underline-gray »>Picture: ESA

By seeing how sturdy this lensing impact is, scientists can calculate the mass of the foreground object — and so they can evaluate this calculated mass to the mass of the seen matter within the foreground galaxy. If there’s a big distinction between the calculated and noticed lots, that means the presence of huge quantities of darkish matter within the foreground.

The opposite impact, galaxy clustering, refers to how galaxies are distributed in three dimensions throughout the universe. Because the universe expands, galaxies are transferring away from us, leading to redshift. Scientists can evaluate the precise distance to a galaxy with its redshift utilizing a phenomenon known as baryon acoustic oscillations, and this will present how briskly the universe is increasing — which is straight associated to darkish vitality.

it’s as a result of it’s unattainable to see distant galaxies in different areas of the sky

Together, these strategies ought to assist cosmologists be taught extra about darkish matter and darkish vitality than ever earlier than. To assemble the information, Euclid will take round 1 million photos from 12 billion objects over the course of its mission. That ought to get us one step nearer to having the ability to each detect and research these elusive phenomena, and to understanding the composition of the universe round us.

“It’s greater than an area telescope,” Laureijs stated, “it’s actually a darkish vitality detector.”

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admin 4 juillet 2023 4 juillet 2023
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