Plus Blog

March 29, 2009
Monday, March 30, 2009

What would you like to know about your Universe — The second poll

This poll is now closed. The most popular question was: "Are the constants of nature really constant?" We will publish the answer in an article and podcast on Plus shortly. Thank you for taking part!

This is our second online poll in our series to celebrate the International Year of Astronomy 2009. Choose your favourite question from the list on the right, and we'll put the one that proves most popular to world-leading astronomers and cosmologists, including Astronomer Royal Martin Rees and author and cosmologist John D. Barrow. The poll will remain open for a month and the answer will be published in a Plus article and podcast soon after. If your most burning question is not on this list, then leave a comment on this blog and we'll endeavour to include it in a future poll — there will be five more polls dotted throughout the year.

The most popular question in our first poll was "What happened before the Big Bang?". You can now read the mind-boggling answer here on Plus, and discuss it on our blog.

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posted by Plus @ 12:10 PM

7 Comments:

At 11:20 AM, Anonymous Anonymous said...

I would be interested to know about the rings of Saturn. Particular points might be:
- Why is Saturn the only planet in the solar system with rings (or is it?)?
- How dense are the rings - would it be possible for a space vehicle to go through them or would it be destroyed in the attempt?
- How quickly are the rings orbiting the planet or are they in stationary orbit?
- What are the rings comprised of - dust, larger particles?
Terry Schooling

 
At 10:25 PM, Anonymous Anonymous said...

I would be interested to know if you could explain how gravity actually works: what is it about bodies with mass that attracts?
Richard Catterall

 
At 11:25 PM, Blogger westius said...

I'd love John to explain what a "Boltzmann Brain" is - that was one of the freakiest things I heard at the very Early Universe conference in 2007 - a very odd merger of Physics, astronomy and philosophy!

 
At 12:21 AM, Blogger Kc said...

Saturn is not the only planet with rings. All the gas giants have them.
- The rings are mostly dust,ice, and cosmic debris so any attempt to go through them would possibly destroy any ship that goes through it.

 
At 5:33 PM, Anonymous jesvin said...

In the last ever paragraph of 'A brief History of Time' Stephen Hawking predicts the unified theory, which can empower scientists, philosophers and public to know the nature of God. I would like to know the efforts in this direction, how do we get there and what are the immediate obstacles before us.

Also nice would be a discussion whether free will exists and whether the universe is deterministic; and are both concepts equivalent?

On matters closer to Earth, I wonder how the LHC finds answers within the terabytes streaming from its detecctors.

 
At 9:31 AM, Blogger Plus said...

We would like to apologise to everyone who, due to a technical glitch on Plus, haven't been able to register their vote on this second poll. We're very pleased to announce the problem is now resolved, and you can once again tell us what you would like to know about your Universe!

Resuming normal transmission....

 
At 12:12 AM, Blogger Dominick said...

What is the universe made of... quite a broad question. I was torn between this question, and the shape of the universe question. I eventually chose shape as my curiosity. I don't think "Why are planets round" warranted the opportunity to be on such a pole... it's clearly because gravity is a central force, so stuff settles that way. To the person who is curious how gravity works, read a bit about general relativity, Einstein answered that question with some math he borrowed from brilliant men. And Jesvin, as far as Stephen Hawking and his discussion of guts goes, there hasn't been much progress. Firstly, I hope it's understood that Hawking uses the word god as a metaphor, not unlike Einstien did. Secondly, look for a blog by Peter Woit of Columbia University called "Not Even Wrong." We, as physicists an mathematicians, are far from a unified theory of everything. In fact, it might not even be possible to come up with one.

 
March 29, 2009
Monday, March 30, 2009

In our online poll to find out what Plus readers would most like to know about the Universe, you told us that you'd like to find out what happened before the Big Bang. We took the question to the renowned cosmologist John D. Barrow, Professor of Mathematical Sciences at the University of Cambridge, and here is his answer. The Universe is an infinitely self-perpetuating foam of bubbles, it seems...

Read more and feel free to discuss the answer by leaving a comment on this blog. We'll periodically check back with the experts to try and answer interesting further questions.

This article is part of a series to celebrate the International Year of Astronomy 2009. The second poll to find out what you'd like to know most about the Universe is open now, so get voting!

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posted by Plus @ 11:00 AM

5 Comments:

At 2:01 PM, Anonymous Common Tater said...

Barrow's remark in his final sidebar that dark matter "consists of stars that don't shine in the dark,..." seems a little beyond our current knowledge. While evidence indicates dark matter reacts to gravity, do we have data showing that its clustering actually produces star-like bodies? ...and thus, by extension, perhaps even "dark black" holes??

 
At 5:17 AM, Anonymous Anonymous said...

This may be the best bit of cosmology for the lay person I've ever read.

Until very recently there has been a strong bias toward the view that the observable universe is representative of the universe as a whole. Barrow does a very good job of looking beyond this to suggest that there is probably a whole range of "universes" and that ours seems special only insofar as we seem to be in the center of it.

Someday historians of science may look back on the conception of the "multiverse" in much the same way as we view the Copernican revolution and the vastly more unsettling recognition of "island universes" (galaxies). As first our solar system and then our galaxy seemed islands in something much more vast and unknowable, so too is the bubble we call the "universe"

 
At 9:18 AM, Anonymous The Plus Team said...

One of our readers asked (in response to the accompanying podcast) whether the laws of physics have to be the same in each bubble. We asked Professor Barrow and here is his response:

""Indeed, we know that in some theories of fundamental physics there is the possibility that important aspects of physics, like the strengths of basic forces or the masses of elementary particles, will fall out differently in the
different regions we have called 'bubbles'. Other local features, like the level of non-uniformity in the material density or the balance between matter and antimatter may also be different.

At present we don't believe there can exist atom-based life like ours except where things are very close to what we
observe in our 'bubble'.

String theory also allows the number of large dimensions of space to be different from one bubble to another. But we know that with more than three large space dimensions no atoms or planets or stars can exist. The attractive forces of nature fall off too rapidly with distance to hold things together. For example, in an N dimensional space the familiar 'inverse square' laws of gravity and electromagnetism become inverse (N-1) laws."

 
At 10:04 AM, Anonymous Scientist Exposer said...

What the author fails to do is answer the basic question, "What happened before the Big Bang?", or "What existed prior to the creation of the material universe?" He simply answers (paraphrasing), "The source was quantum foam", or "It has always existed", neither of which provide any sort of solid answer. Where did the 'quantum foam' come from?Until he can provide definitive information on the origin of life and the universe, then all his words are fantastic hot air at best and complete bluffing and deception at worst.

 
At 4:10 PM, Blogger Medice said...

Is it possible that before the big bang the Universe or whatever we want to call it, was in fact composed of super condensed black matter. At the centre of this matter and due to extreme gravitational forces a portion,particle of light matter came into existance and the interaction of light matter and dark matter created the Universe as we know it today, ie dark matter is now at the edge of the universe and accelerating pulling the exisitng Galaxies with it ,expanding the universe. When the fabric of the dark matter becomes for want of a better word thinned out,the accelerating light matter will come into contact with sufficient dark matter to reverse the whole process making the universe 99.999% dark matter, unitl the gravitational forces once again create particles of light matter and once again interact with the dark matter, thus repeating the whole exercise again and again. Also could we know call the God particle the initial interacting light material

 
March 26, 2009
Thursday, March 26, 2009

The Abel Prize 2009, one of the most prestigious prizes in mathematics, has been awarded today to the Russian-born mathematician Mikhail Gromov for "his revolutionary contributions to geometry".

Read more...

March 25, 2009
Wednesday, March 25, 2009

Maths phobe goes forth to multiply

A date for your TV diary: next Tuesday, the 31st of March 2009, at 9pm, BBC2 will screen the Horizon programme Alan and Marcus go forth and multiply, in which actor and comedian Alan Davies explores his fear of maths with mathematician and author Marcus du Sautoy. Together they will visit the fourth dimension, cross the universe and explore infinity, and along the way Alan does battle with some of the toughest maths questions of our age. Let's hope he's done some swotting with Plus first!

posted by Plus @ 12:25 PM

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March 25, 2009
Wednesday, March 25, 2009

The Abel Prize 2009

The Abel Prize 2009 will be announced tomorrow, March 26th, and you will be able to view the ceremony live in the Abel prize webcast. The ceremony announcing the winner of one of the most prestigious pirzes of mathematics will begin at 11am UK time (12 noon Norwegian time), and soon after Plus will give you more details.

You can find out more about previous winners of the Abel Prize on Plus.

posted by Plus @ 3:59 PM

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March 19, 2009
Thursday, March 19, 2009

Travels in a mathematical world

If you enjoy the Plus podcasts, then you might also like a maths podcast published by Peter Rowlett, the University Liaison Officer of the Institute of Mathematics and its Applications. On his travels he records short interviews with interesting mathematicians talking about their career and work. There are also episodes on the history of mathematics and on mathematical news, and the webpage also contains a blog.

posted by Plus @ 3:24 PM

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