Contents
Laniakea: Our home supercluster
นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูเพิ่มเติม
Superclusters – regions of space that are densely packed with galaxies – are the biggest structures in the Universe. But scientists have struggled to define exactly where one supercluster ends and another begins. Now, a team based in Hawaii has come up with a new technique that maps the Universe according to the flow of galaxies across space. Redrawing the boundaries of the cosmic map, they redefine our home supercluster and name it Laniakea, which means ‘immeasurable heaven’ in Hawaiian.
Read the research paper: http://dx.doi.org/10.1038/nature13674
Read Nature’s news story: http://www.nature.com/news/earthsnewaddresssolarsystemmilkywaylaniakea1.15819
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This Virus Shouldn’t Exist (But it Does)
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https://sites.google.com/view/sourcesgirus/
Hidden in the microverse all around you, there is a merciless war being fought by the true rulers of this planet, microorganisms. Amoebae, protists, bacteria, archaea and fungi compete for resources and space. And then there are the strange horrors that are viruses, hunting everyone else. Not even being alive, they are the tiniest, most abundant and deadliest beings on earth, killing trillions every day. Not interested in resources, only in living things to take over. Or so we thought.
It turns out that there are giant viruses that blur the line between life and death – and other viruses hunting them.
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How far away is it – 10 – The Milky Way (4K)
Document http://howfarawayisit.com/wpcontent/uploads/2019/04/TheMilkyWay2019edition1.pdf
Index http://howfarawayisit.com/wpcontent/uploads/2020/12/HowFarIndex.pdf
Music free version https://www.youtube.com/watch?v=5282MSPqTrg\u0026list=PLpH1IDQEoE8SyDxfRqzAiyRhwOpNqim1
In this segment of our “How far away is it” video book, we cover the structure of the Milky Way galaxy.
We start with a highlevel description of the three main components: the galactic center with its black hole, the galactic disk with its spiral arms, and the galactic halo stretching far out in all directions using the European Space Agency spacecraft Gaia’s findings. We also show how full images of the Milky Way can be created from within the galaxy.
Using the full power of the Hubble, Spitzer, and Chandra space telescopes, we take a deep dive into the center of our galaxy with its central bulge. We detail the evidence for the existence of a supermassive black hole, Sagittarius A, at the very center of the galaxy’s core. We cover and illustrate the work done by the UCLA Galactic Centre Group in conjunction with the new Keck observatory on top of the Mauna Kea volcano in Hawaii, and the Max Plank Institute for Extraterrestrial Physics in Germany and more recently and the European Southern Observatory with its array of Very Large Telescopes in Chile. This includes a look at how close the star S2 approached Sgr A and what that black hole might look like. In addition, we cover stellar interferometry with ducks on a pond to see how these measurements were done.
Next, we go a level deeper into the nature of a Black Hole singularity. We cover the Schwarzschild radius, event horizon, accretion disk, gravitational lensing, and gammaray jets. We then actually build Sgr A. In addition to the supermassive black hole, we take a look at a solar mass black hole.
We then cover the structure of the galactic disk including: the bar core, the two 3 Parsec arms, ScutumCentaurus, Perseus, Sagittarius with its Orion Spur, Norma and the Outer Arm. We review the locations of various celestial objects we’ve seen in previous Milky Way segments, to show how close to us they are. We also cover the disk’s rotation and the Sun’s orbit. We look at our solar system’s Ecliptic Plane with respect to the galactic plane. And we cover the galaxy’s dust clouds and how we see them with radio astronomy. We also cover the galaxy’s rotation curve and its connection with dark matter.
Next, we cover the galactic halo. We start with Shapley’s globular cluster map that first showed that we were not at the center of the galaxy. We cover the size of the halo, the inner and outer halos orbital motion, and the newly discovered galaxy within our galaxy called GaiaEnceladus. We end with recent discoveries of massive amounts of Hydrogen in the halo and this findings impact on the Dark Matter debate. And we end with a calculation of the entire Milky Way’s mass.
We end our galaxy coverage by illustrating how far one would have to go to take a picture that would include what we see in our illustrations. We conclude the chapter with another look at the distance ladder that took us across the galaxy.
@00:00 Beethoven, Ludwig van: Symphony No.9 in D minor Op.125, ‘Choral’ : III Adagio molto e cantabile; Daniel Barenboim \u0026 Staatskapelle Berlin; from the album “Beethoven : Symphonies Nos 1 9 \u0026 Overtures” 2004
@24:47 Tchaikovsky, Pyotr Ilyich: Symphony No. 5 in E minor, Op. 64; Bernard Haitink, Royal Concertgebouw Orchestra, Amsterdam, 2012
A 3D atlas of the universe – Carter Emmart
View full lesson: http://ed.ted.com/lessons/a3datlasoftheuniversecarteremmart
For the last 12 years, Carter Emmart has been coordinating the efforts of scientists, artists and programmers to build a complete 3D visualization of our known universe. He demos this stunning tour and explains how it’s being shared with facilities around the world.
Talk by Carter Emmart.
นอกจากการดูหัวข้อนี้แล้ว คุณยังสามารถเข้าถึงบทวิจารณ์ดีๆ อื่นๆ อีกมากมายได้ที่นี่: ดูบทความเพิ่มเติมในหมวดหมู่WIKI
