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The universe is filled with planets, asteroids, black holes, and galaxies—each with their
own set of mysteries.
But one of the best concealed aspects of deep space lies in what scientists describe as
This is where dark energy and dark matter hide, interacting with the matter we
can actually see.
Scientists know very little about this dark side, other than that it's vast and it has
shaped the evolution of our Universe—past, present, and future.
And since we can't see it directly, the hunt to understand dark energy and dark matter
has taken decades. But ESA's space telescope mission, named Euclid might just give us
some answers.
According to ESA, the universe is made of
about 76% dark energy, about 20% dark matter, and 4% normal, or baryonic matter– which
is the stuff that makes up you, me, and everything else we can see.
When it comes to dark matter,
we can infer its presence based on the gravitational effect on visible matter, and
theories suggest that weak interacting massive particles, could lead to the answer.
But as of right now, we just know that it exists.
“Dark energy” is another astronomical head scratcher.
This term is used to explain the mysterious force that causes the rapid expansion of the
universe.
According to the theory of relativity, the gravitational attraction from all the matter
in the universe should be slowing this expansion.
But observations show that instead, it's speeding up.
In order to come to grips with this new realization, theorists have come up with other possible
explanations for dark energy. Maybe the universe is filled with a strange energy-fluid,
or it was the result of another version of Einstein's theory of general relativity that
involves an equation that stops expansion altogether. Or parts of
the theory of general relativity are wrong, and we need a new field that includes this
acceleration.
Which is why Euclid is so exciting.
This mission could piece together the puzzle that surrounds dark energy and dark matter,
and ultimately help us understand how our universe works.
ESA's Euclid space telescope will map the geometry of the dark Universe and provide
its cosmic history.
Euclid will observe and analyze the shape and redshift of thousands of millions of galaxies
spanning back 10 billion years.
This will provide a large-scale 3D map that allows scientists to see how dark energy has
played a significant role in the universe's expansion.
And it will do this with a few key components.
Other than the Silicon Carbide mirror that spans 1.2 meters in diameter, the telescope
will be feeding two different instruments: a visible-wavelength camera and a near-infrared
camera spectrometer. These instruments will be pointed at more than one third
of the entire sky
Now you might be thinking, if Euclid can't directly observe the dark universe,
then what will its instruments be looking at?
Well, the space telescope will be searching for a couple of cosmological 'red' flags.
The first is weak gravitational lensing.
In general, gravitational lensing is when the gravitational field of an object bends the light
that passes by it. So if we assume that dark matter is present, then astrophysicists
can theorize that every galaxy we observe might be subject to a minute amount of gravitational
lensing…approximately 1%. This is the weak lensing and it's what Euclid will be hunting for.
Euclid is also going to be on the hunt for Baryonic Acoustic Oscillations or what ESA
describes as “wiggle patterns” within galaxy clusters.
These patterns provide a standard ruler method for measuring dark energy with the expansion
rate of the universe.
Euclid's potential is overwhelming, but we've got a little wait on our hands before
this space telescope starts beaming back any astronomical info.
Euclid won't be in the sky until 2022.
It's being assembled by Thales Alenia Space, Astrium Toulouse, and Airbus
Defence and Space.
Not only is this equipment coming together for the assembly of Euclid, but researchers
are already preparing for the massive onset of data that will be coming their way.
Using a dark-matter particle simulation modeled with a supercomputer, researchers created
the largest simulated galaxy catalogue ever made.
These synthetic galaxies mimic the characteristics of real galaxies, including their shapes,
colors, luminosities, spectra, and gravitational lensing distortions.
This is a critical milestone in the Euclid project, and everything the researchers are
preparing for will help set the foundational science for when the real data comes in.
Euclid plans to station for six years and when it finally takes to the skies, we'll all
be waiting patiently for the confirmation about the parts of the dark Universe we already
know, and all the parts we have yet to uncover.
With all the exciting missions ahead, we want to know which ones do you want to hear about?
Let us know below and don't forget to subscribe to Seeker, so you never miss an episode.
Thanks for watching and we'll see you next time on Seeker.
コツ：単語をクリックしてすぐ意味を調べられます！

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中級

How ESA’s Dark Energy Telescope Will Map the ‘Dark Universe’ | Countdown To Launch

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林宜悉 2019 年 10 月 14 日 に公開

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