Discover and read the best of Twitter Threads about #cosmology

Most recents (9)

1. “The Death of a Universe” -- Terrific talk this evening by Dr. Katie Mack (@AstroKatie) at @yorkuniversity. Here are a few highlights. This of course is the CMB, the faint microwave “echo” of the big bang. (cont’d) #physics #astronomy #cosmology (@YorkUScience)
@AstroKatie @yorkuniversity @YorkUScience 2. The big bang happened ~13.8 billion years ago. So what lies ahead? Could the universe collapse in a big crunch? Maybe – but as Prof. Mack explained, it's more likely that it will keep expanding. In fact, the universe is currently not only expanding but also accelerating...
@AstroKatie @yorkuniversity @YorkUScience 3. We seem to live in a universe with a non-zero cosmological constant. Right now, the CC appears small – but in the far future, the CC could come to dominate. That won’t end well! At best, in that scenario, we’re going to freeze to death in the dark...
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In this month's A&G, read all about the growth of the field of Cosmology, from its speculative origins to the respected discipline it is today, by Malcolm Longair doi.org/10.1093/astrog… #cosmology
(Image Credit: NASA/JPL-Caltech/L Jenkins [GSFC]) an image of space, with 3 bright objects
@RoyalAstroSoc @AstronGeo @OxfordJournals @astro_librarian @KICC_official Early research in #MNRAS was largely based on observational astronomy, but a great number of important advances in cosmology have since been published with us as the field has grown. We look back on some of these groundbreaking discoveries... Hubble Deep Field. A detailed image of space.
The work of Albert Einstein was a clear foundation of things to come, outlined by Willem de Sitter in #MNRAS through a compilation of papers, starting with ‘On Einstein's Theory of Gravitation and its Astronomical Consequences’👨‍🏫doi.org/10.1093/mnras/… #Einstein A photograph of Albert Einstein, writing on a blackboard.
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TO SEE A WORLD IN A GRAIN OF SAND
AND A HEAVEN IN A WILD FLOWER
HOLD INFINITY IN THE PALM OF YOUR HAND
AND ETERNITY IN AN HOUR
-WILLIAM BLAKE
In the beginning was the logos, the Big Bang, the primordial OM. Image
Big Bang Theory says that the physical universe spiralled out of an unimaginably hot and dense single point called a ‘singularity’ billions of times smaller than the head of a pin.

It does not say why? Or how? Image
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Over the next week, we're going to be looking back at the most cited #MNRAS papers of the decade 🏆 Together they've been cited nearly 10,000 times!
🔟 The 10th most cited #MNRAS paper of the decade was: Too big to fail? The puzzling darkness of massive Milky Way subhaloes by Michael Boylan-Kolchin @MBKplus et al
doi.org/10.1111/j.1745…
#astronomy #MilkyWay
@MBKplus @RoyalAstroSoc @OxfordJournals 9⃣ The 9th most cited #MNRAS paper of the decade was: E pur si muove: Galilean-invariant cosmological hydrodynamical simulations on a moving mesh by Volker Springel of the Max Planck Institute for Astrophysics doi.org/10.1111/j.1365… #cosmology
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#UniverseOrigins (#OriginsoftheUniverse)

@gkarani1 @TTawonga

The Universe consists of 3 types of substance: normal matter, 'dark matter' & 'dark energy'. Normal matter consists of the atoms that make up stars, planets, human beings & every other visible object in th Universe.
@gkarani1 @TTawonga In the currently scientific understanding of the Universe, 70% is dark energy, 25% dark matter and 5% normal matter.
@gkarani1 @TTawonga 3/ Hydrogen is the most common element found in the universe, followed by helium; together, they make up nearly all normal or ordinary matter.

After defining what a universe is, lets move to how it all started.
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@godless_mom Heaven is just a fairy story for those afraid of the LIGHT
#TheoreticalPhysicists prefer to believe in the heavenly fairy tales they can concoct themselves.
#cosmology #Heaven #GOD #Truth #StephenHawking #NeildeGrasseTyson
@godless_mom Don’t know if they buried #StephenHawking in a black hole, like most people, but he said: "If you feel you are in a black hole, don’t give up. There’s a way out."
theguardian.com/science/2015/a… #Hawking #BlackHoles #MythMath #cosmology #NeildeGrasseTyson #atheist
@godless_mom Imagine there’s no #BlackHole heaven.
#StephenHawking didn't know what to believe about the NOTHING of #BlackHoles.
nature.com/news/stephen-h… #atheists #cosmology
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Here we go, time for my first thread about a new paper, out today on your local arXiv server! #sciencetwitter #physics #hepph #darkmatter #cosmology #earlyuniverse #plasma arxiv.org/pdf/1902.08623…
1/ Backstory: we've been looking for dark matter for a long, long time and we haven't found it. We're pretty sure it's a particle based on the concordance of evidence from a wide variety of astrophysical environments, but we're not sure what kind of particle it is.
2/ Since we've been looking pretty hard in a couple of particle mass ranges (most notably we've been looking for dark matter particles that are heavier than a proton) and since we haven't found it, folks are starting to wonder if other dark matter masses are possible/interesting
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New @Planck results out today. Everybody get reading!! cosmos.esa.int/web/planck/pub… #cosmology #CMB #astrotastic
@Planck This paper gives a comparison between likelihoods for the data - generally in agreement although for some parameters there is a systematic difference of 0.5sigma between likelihoods on the same data.
@Planck Which is also shown in this figure, comparing the ’15 results to the ’18 ones (the systematic likelihood shift is the worst for the baryon density, and therefore the shift between different releases).
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Expanding the #HertzsprungRussell diagram courtesy of @xkcdComic

#Physics #Astronomy #Cosmology

Step 1: Take an HR Diagram
Expanding the #HertzsprungRussell diagram courtesy of @xkcdComic

#Physics #Astronomy #Cosmology

Step 2: Add a Scale
Expanding the #HertzsprungRussell diagram courtesy of @xkcdComic

#Physics #Astronomy #Cosmology

Step 3: Expand the Diagram
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