Hubble, Mt. Wilson and the Expanding Universe
Edwin Hubble's contributions have been invaluable to the study of our universe. We visited Mt. Wilson Observatory to learn about his research and his legacy. FOLLOW US on social media and at our website!
Hubble’s Contentious Constant Is In Trouble
Thanks to astronomer Edwin Hubble and others, scientists have known since 1929 that our universe is expanding. Its current rate of expansion is called Hubble’s Constant (H0). There are two leading ways to measure H0, and for fifteen years, they more or less agreed with one another. Not anymore, and that’s a big deal. Here’s why. In the “Standard Model of Cosmology,” H0 is a crucial ingredient, right up there with the speed of light. H0 factors into everything we know about the universe: how old it is, how big it is, what it’s made of... If H0 is ‘tweaked’, we get a different age of the universe, different relative amounts of matter, dark matter, dark energy, and so on. Unlike the speed of light, however, scientists can’t measure H0 in the laboratory. Instead, H0 has to be inferred from observations of the universe. One way scientists have measured H0 is to use observations of type 1a supernovae combined with their host galaxies redshifts. Each 1a supernova releases roughly the same amount of light when it explodes. Measuring the amount of light we receive from a 1a supernova tells us its distance. Measuring an object’s redshift, or its increase in wavelength, tells us how fast that object is moving away from Earth. Researchers use many 1a supernovae as distance markers, measuring objects in our local universe then moving out to get a measurement of the universe’s rate of expansion. The other H0 measurement technique looks at the Cosmic Microwave Background (CMB) -- the “afterglow” from the Big Bang itself. The early universe was hot and dense, light couldn’t travel freely through space. As the universe cooled, the photons were released. This radiation left an imprint, providing insights into the composition of the universe at that time. The CMB can be used to make measurements from the early universe such as the density of dark matter and dark energy. Those measurements can be combined with the model of the evolution of the universe, allowing researchers to infer the rate of expansion of the universe, or Hubble’s Constant. As these two camps have improved their abilities to measure H0, it has become clear that they disagree. A recent study using the first method yielded an 8% greater expansion rate than the second method’s result. Now scientists are asking: Are we missing something? Wendy Freedman, Sullivan professor of astronomy and astrophysics at the University of Chicago says, “It could be that we don’t understand the uncertainties well enough to know why these two methods differ.” Freedman led a 2001 study using the Hubble Space Telescope to measure H0 via the first method, and is leading a new project to measure it more accurately. Another intriguing question: Is it incorrect to expect agreement in these measurements of H0? Maybe the Standard Model of Cosmology, which predicts agreement, is wrong. That would send researchers on an exciting search for a new model of the cosmos. “Do we really know what makes up all of the radiation in the Big Bang?” wonders Freedman. “Is there a new kind of particle we aren’t accounting for? Or are dark energy’s or dark matter’s properties changing over time? Over the next few years, researchers like Freedman will be trying to poke holes in how each method conducts its analysis -- before possibly invoking a revised model of cosmology. Credit: NASA science.nasa.gov.
ScienceCasts: Hubble’s Contentious Constant
Visit http://science.nasa.gov/ for more. There are two leading ways to measure the universe's rate of expansion, and for fifteen years, they more or less agreed with one another. Not anymore, and that’s a big deal.
EDWIN HUBBLE - 20 November 1889
Happy Birthday to one of the great modern astronomers and pioneer in galaxy identifiaction, Mr Edwin Hubble!!
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The Hubble constant and our expanding universe!!
Welcome to the Hubble Constant and Hubble's Law!!!
The first time I learned about this theory my mind exploded.
It's too good to not share!!
Hubble's Law is based on the discover made by Astronomer Edwin Hubble, that a lot of what we see in the night sky is not all from our Milky Way galaxy, but instead a whole other galaxy!!! This discover lead to the discovery of many other galaxies and the acceleration of them, leading to the realization that our universe is expanding--and expanding at a very fast rate at that!
INSANE... I know!
There's so much cool stuff to learn out there, so keep exploring and thanks for watching!
See ya next week! xoxo
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You can support us by purchasing something through our Amazon-Url, thanks 🙂 The Hubble sequence is a morphological classification scheme for galaxies invented by Edwin Hubble in 1926.It is often known colloquially as the Hubble tuning fork diagram because of the shape in which it is traditionally represented.Hubble’s scheme divides regular galaxies into 3 broad classes – ellipticals, lenticulars and spirals – based on their visual appearance .A fourth class contains galaxies with an irregular appearance. ---Image-Copyright-and-Permission---
About the author(s): The original uploader was Cosmo0 at English Wikipedia (Original text: None given)
License: Public domain
---Image-Copyright-and-Permission--- This channel is dedicated to make Wikipedia, one of the biggest knowledge databases in the world available to people with limited vision. Article available under a Creative Commons license
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Edwin Hubble And His Landmark Discoveries
Edwin Hubble's Galactic Observations - 7/30/16 - Physics II
TNECampus final Capstone Project
How Hubble Changed Astronomy
Astronomer Katey Alatalo talks about the Hubble sequence of galaxies and Edwin Hubble's discoveries. Watch the full Carnegie Institution for Science lecture: http://f4a.tv/1TkHVsZ
Just For Fun! - Astronomy (14) How Did They Figure Out The Age of The Universe?
Visit http://ilectureonline.com for more math and science lectures! In this video I will explain out astronomers (Edwin Hubble) calculated the age of the universe. Next video in this Just For Fun series can be seen at:
Amazing Plan - Distressed by Kevin MacLeod is licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/by/4.0/)
The Man the Hubble Space Telescope was Named After
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https://youtu.be/hhsO5XNDcR8?list=PLR0XuDegDqP33-NUx7wuKb-3PDj-gRKgR In this video: The man behind the name is Edwin Hubble. Born in 1886, Hubble enjoyed books like Jules Verne’s 20,000 Leagues Under the Sea, perhaps a prelude to his lifelong dedication to science and astronomy. His family initially lived in Missouri, but moved to Chicago when he was just ten years old. Want the text version?: http://www.todayifoundout.com/index.php/2014/02/hubble-telescope-named/ Sources: http://www.mtwilson.edu/his/art/g1a4.php
Edwin Hubble - The Eyes Behind the Telescope - HD
Explore the man behind the name, Edwin Hubble, and the great observations he made in order to take us further and understand more about the way we view space in modern day Astrology. What did Hubble discover? How did He take us further? what changes did Hubble bring to Modern day Astrology? Edwin Powell Hubble was an American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century. Read more about Edwin here: https://en.wikipedia.org/wiki/Edwin_Hubble
http://hubblesite.org/the_telescope/hubble_essentials/edwin_hubble.php All footage sourced from HubbleCast
Edwin Hubble and and His Observation of Other Galaxies Outside of the Milky Way
Edwin Hubble, the Hubble Telescope and the Expansion of the Universe.
A brief walk-through of Edwin Hubble's observations, the Hubble Telescopes observations, and how they have contributed to the idea of an expanding universe.
Hey Bill Nye, 'Is the Expansion of the Universe Gaining Speed?' #TuesdaysWithBill
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Edwin Hubble, the Expanding Universe, Hubble's Law. Astronomers of the 20th Century.
Edwin Powell Hubble was an American astronomer who played a crucial role in establishing the field of extragalactic astronomy and is generally regarded as one of the most important observational cosmologists of the 20th century.
Hubble is known for showing that the recessional velocity of a galaxy increases with its distance from the earth, implying the Universe is expanding, a law of physics known as "Hubble's law". Subscribe - never miss a video!
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Space Today TV Ep.86 - A Biografia de Edwin Hubble
🚀Aprenda Astronomia no maior Curso de Astronomia do Brasil: https://academyspace.com.br/bigbang
No último século, os astrônomos descobriram muitos objetos cósmicos novos e misteriosos, como quasars, buracos negros, explosões de raios gamma e distantes exoplanetas. As recentes descobertas podem até ser impressionantes, mas a alguns anos atrás, durante os anos de 1920, um único homem mudou toda a percepção do nosso lugar no universo, seu nome era Edwin Hubble. Nascido no Missouri em 1889, Edwin Hubble desenvolveu sua paixão por astronomia logo cedo, depois de ganhar seu primeiro telescópio quando ele tinha apenas 8 anos. Em 1917, enquanto fazia seu doutorado, Hubble recebeu uma oferta de trabalho que mudou sua vida para sempre, oferta essa feita por Ellery Hale, fundador do Observatório Monte Wilson, na Califórnia. Mas a oportunidade surgiu numa hora errada, os EUA tinham acabado de entrar na Primeira Guerra Mundial, e Hubble havia se alistado no exército. Em 1919, o agora Major Hubble retornou da guerra e imediatamente viajou para o Observatório de Monte Wilson, ainda com uniforme, ele chegou e anunciou que estava pronto para iniciar as observações. Em 1923, Hubble fez sua primeira importante descoberta usando a mais avançada tecnologia da época, o Telescópio Hooker de 2.5 metros, medindo a distância para as estrelas conhecidas como Variáveis Cefeidas. Ele então descobriu que elas residiam em galáxias que não eram a Via Láctea. Naquela época, a visão que prevalecia era de que o universo era constituído somente da Via Láctea. Hubble descobriu que a nossa Via Láctea era somente uma das muitas que existiam, mudando para sempre a nossa visão do nosso lugar no universo. Depois dessa descoberta espetacular, Hubble começou a analisar e classificar as galáxias que eram descobertas, agrupando-as de acordo com a sua aparência visual, em espirais, elípticas, lenticulares, e aquelas que tinham uma aparência irregular.
Essa classificação ficou conhecida como a Sequência de Hubble e ainda é o sistema mais popular existente para classificar as galáxias. A maior realização de Hubble veio em 1929, quando ele determinou que a luz que nós recebemos das galáxias é mais avermelhada quanto mais distante de nós a galáxia está.
Com isso ele foi capaz de deduzir que quanto mais distante uma galáxia está de nós mais rápida ela parece se afastar. A chamada Lei de Hubble, a descoberta observacional dessa relação, derruba a visão convencional de um universo estático e demonstra que o universo está se expandindo. Essa é considerada a primeira evidência observacional da teoria do Big Bang. Hubble gastou a última parte da sua carreira fazendo campanha para que a astronomia fosse reconhecida como uma área da física pelo comitê do prêmio Nobel. O comitê finalmente fez com que seu trabalho astronômico fosse elegível para o prêmio de física em 1953, mas Hubble nunca soube disso, pois ele morreu poucos meses antes. Se a decisão tivesse sido tomada um pouco antes Hubble poderia ter vivido para receber um prêmio Nobel. Anos depois da morte de Hubble, a NASA e a ESA batizaram seu novo telescópio espacial em homenagem a Edwin Hubble. Hubble foi a escolha óbvia ao nomear um novo observatório que iria revolucionar o campo da astronomia, da mesma maneira que Edwin Hubble mudou a nossa percepção do universo e o nosso lugar dentro dele, e o seu espírito de descoberta com certeza vive hoje junto com o Telescópio Espacial Hubble. Email para enviar os vídeos: [email protected]
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Life Of Hubble
Decades before the Hubble Space Telescope, Dr. Edwin Powell Hubble revolutionised the field of astronomy. Take a look at the life and work of this brilliant American astronomer for whom the Hubble Space Telescope is named. From Hubblecast.
Hubblecast 89: Edwin Hubble
When you hear the name "Hubble", you probably think of the NASA/ESA Hubble Space Telescope. But, decades before the Hubble Space Telescope, Dr Edwin Powell Hubble revolutionised the field of astronomy. In the newest Hubblecast, we take a look at the life and work of this brilliant American astronomer for whom the Hubble Space Telescope is named. More information and download options: http://www.spacetelescope.org/videos/hubblecast89a/ Subscribe to Hubblecast in iTunes! https://itunes.apple.com/gb/podcast/hubblecast-hd/id258935617 Receive future episodes on YouTube by pressing the Subscribe button above or follow us on Vimeo: https://vimeo.com/hubbleesa Watch more Hubblecavideo.web_category.allst episodes: http://www.spacetelescope.org/videos/archive/category/hubblecast/ Credit:
Directed by: Mathias Jäger
Visual design and editing: Martin Kornmesser
Written by: Rebecca Louise Davies, Georgia Blazon
Narration: Sara Mendes da Costa
Images: NASA, ESA/Hubble, Huntington Library, California Institute of Technology, Hans A. Rosbach, Jonathunder
Animations: NASA, ESA/Hubble
Music: zero-project (zero-project.gr)
Web and technical support: Mathias Andre and Raquel Yumi Shida
Executive producer: Lars Lindberg Christensen