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The Daily Cosmos or Interesting Facts about the Universe

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The Daily Cosmos or Interesting Facts about the Universe

Cosmology
Astrophysics
Astronomy

Location: #science
Members: 58
Latest Activity: on Wednesday

 

Cosmology - Astrophysics - Astronomy

 

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Big Bangers' Imaginations Supply Their Story's Only Support.

Started by May the Big Bang RIP. Last reply by May the Big Bang RIP Jul 23, 2017. 6 Replies

'Hot Jupiter'

Started by Mrs.B. Last reply by Mrs.B Apr 9, 2016. 7 Replies

NASA's Solomon's Choice.

Started by Davy Oct 3, 2013. 0 Replies

This is Science at Work.

Started by Davy. Last reply by Davy Aug 15, 2013. 1 Reply

Starts With A Bang

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Comment by Stephen on June 23, 2018 at 9:08am

Doone smashing pictures of the future cities.

We in the UK had a TV programme called Tomorrows World where they would try and predict the landscape and technology of the near and far future. As you would expect they were dead hot on the near future predictions. According to their predictions, we should all be flying our own Helicopters by now. One of the more exciting predictions was that we should have had a lunar base by now. When you think about it we have definitely slowed down with the space programs.

Comment by Doone has Fremdschämen on June 23, 2018 at 8:19am

Good note, Stephen.  The Universe is an amazing place!  We are lucky to be living the best universe! 

Comment by Stephen on June 23, 2018 at 8:10am

Hubble proves Einstein correct on galactic scales (heic1812)
21 June 2018
An international team of astronomers using the NASA/ESA Hubble Space Telescope and the European Southern Observatory's Very Large Telescope has made the most precise test of general relativity yet outside our Milky Way. The nearby galaxy ESO 325-G004 acts as a strong gravitational lens, distorting light from a distant galaxy behind it to create an Einstein ring around its centre. By comparing the mass of ESO 325-G004 with the curvature of space around it, the astronomers found that gravity on these astronomical length-scales behaves as predicted by general relativity. This rules out some alternative theories of gravity.

Using the NASA/ESA Hubble Space Telescope and European Southern Observatory's Very Large Telescope (VLT), a team led by Thomas Collett (University of Portsmouth, UK), was able to perform the most precise test of general relativity outside the Milky Way to date.
The theory of general relativity predicts that objects deform spacetime, causing any light that passes by to be deflected and resulting in a phenomenon known as gravitational lensing. This effect is only noticeable for very massive objects. A few hundred strong gravitational lenses are known, but most are too distant to precisely measure their mass. However, the elliptical galaxy ESO 325-G004 is amongst the closest lenses at just 450 million light-years from Earth.
Using the MUSE instrument on the VLT the team calculated the mass of ESO 325-G004 by measuring the movement of stars within it. Using Hubble the scientists were able to observe an Einstein ring resulting from light from a distant galaxy being distorted by the intervening ESO 325-G004. Studying the ring allowed the astronomers to measure how light, and therefore spacetime, is being distorted by the huge mass of ESO 325-G004.
Collett comments: "We know the mass of the foreground galaxy from MUSE and we measured the amount of gravitational lensing we see from Hubble. We then compared these two ways to measure the strength of gravity – and the result was just what general relativity predicts, with an uncertainty of only nine percent. This is the most precise test of general relativity outside the Milky Way to date. And this using just one galaxy!"
General relativity has been tested with exquisite accuracy on Solar System scales, and the motions of stars around the black hole at the centre of the Milky Way are under detailed study, but previously there had been no precise tests on larger astronomical scales. Testing the long range properties of gravity is vital to validate our current cosmological model.
These findings may have important implications for models of gravity alternative to general relativity. These alternative theories predict that the effects of gravity on the curvature of spacetime are "scale dependent". This means that gravity should behave differently across astronomical length-scales from the way it behaves on the smaller scales of the Solar System. Collett and his team found that this is unlikely to be true unless these differences only occur on length scales larger than 6000 light-years.
"The Universe is an amazing place providing such lenses which we can use as our laboratories," adds team member Bob Nichol (University of Portsmouth). "It is so satisfying to use the best telescopes in the world to challenge Einstein, only to find out how right he was."

Comment by Doone has Fremdschämen on June 22, 2018 at 8:56pm

Where did our nice imaginary future go?

Fantastic futures, illustrated by Frank R. Paul, Eberhard Binder, Syd Mead, and Shusei Nagaoka.

 
Comment by May the Big Bang RIP on June 21, 2018 at 1:01am

Why the emotionalism?

Geocentrists wanted the earth to be the center of the universe, and medieval churchmen hated its demise.

The Big Bang is anthropocentrism’s last hurrah.

Humankind is an accident, and some humans REALLY HATE THAT. If they could get away with burning people at stakes, they would do it to electric universe folk.

Comment by Doone has Fremdschämen on June 18, 2018 at 7:54am

The 4th Flavor? Scientists Close in on a New Kind of Neutrino

Comment by Doone has Fremdschämen on June 16, 2018 at 11:24am

Isolating on Earth  

Charming idea and very interesting for us living outside the US. shows the closest major US city across the world. Source:

Comment by Doone has Fremdschämen on June 14, 2018 at 9:15pm

Ancient Earth globe shows where you were located 750 million years ago

Comment by Doone has Fremdschämen on June 11, 2018 at 1:47pm

This Is Why Physicists Think String Theory Might Be Our 'Theory Of Everything' When it comes to quantum gravity, General Relativity, and the Standard Model, string theory, despite all its flaws and lack-of-testability, is still the top game in town.

https://www.forbes.com/forbes/welcome/?toURL=https://www.forbes.com...

Comment by Doone has Fremdschämen on June 11, 2018 at 1:45pm

: What if ocean and land mass were switched? Article explores where you'd want to live in this strange world:

 
 
 
 

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