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Ask a physicist anything. (5)

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Wiccan_Child

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Why is the universe expanding at a faster rate than it was in the past?
We don't know. Current hypotheses generally involve 'dark energy', that is, a hitherto unknown quantity of energy counteracting gravity's attraction, but is otherwise undetectable - or 'dark'.
 
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Wiccan_Child

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I got an email from a friend of mine who is interested, but not very well versed, in science. He's a creationist - alas, but that's the way it goes with excessive influence from the wrong groups across the pond.

Regardless, the message was a question about relativity, and I thought the site he quoted was so *ahem* "interesting" I thought I'd post it here.

First off, his quote from the site in question:


The site: 21st Century Ideas

What do you think? I think it's.. Errr... A little tin-foil-hat-ish. To be kind.
To say the least... I've heard that idea before, and it kinda misses the point. His analogy of 'if it were sideways, people would point it out' is good, but still, waaaaay off the mark sunshine :p.
 
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1611AV

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Seems when discussing or arguing any field of science, there is always a limit on how far the conversation can proceed without reaching the limit of that said field or being passed over to some other field of science.

Science is very compartmentalized. For instance Evolution, A Evolutionist will say well we can tell you how things evolve but not tell you from what everything evolved from and at what point did non life become life and how did that happen.

Big Bang same thing, science can explain the expansion but not the origin of the "little ball of energy" or what it exploded into.

This trend continues into every subject and field. So my question is, is there a field of science that works on connecting all the dots and filling in the blanks from one theory to the next?
 
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mzungu

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Seems when discussing or arguing any field of science, there is always a limit on how far the conversation can proceed without reaching the limit of that said field or being passed over to some other field of science.

Science is very compartmentalized. For instance Evolution, A Evolutionist will say well we can tell you how things evolve but not tell you from what everything evolved from and at what point did non life become life and how did that happen.

Big Bang same thing, science can explain the expansion but not the origin of the "little ball of energy" or what it exploded into.

This trend continues into every subject and field. So my question is, is there a field of science that works on connecting all the dots and filling in the blanks from one theory to the next?
And your point being? I ask this because you have betrayed a total lack of understanding on how science works. Now since you are so keen on passing judgement on something you have no knowledge of then perhaps we should refer to Islam to explain Christianity for us?
 
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AV1611VET

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Seems when discussing or arguing any field of science, there is always a limit on how far the conversation can proceed without reaching the limit of that said field or being passed over to some other field of science.
It always cracks me up when a geologist here will tell me about physics, a physicist will tell me about biology, and a biologist will tell me about geology.
 
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1611AV

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It always cracks me up when a geologist here will tell me about physics, a physicist will tell me about biology, and a biologist will tell me about geology.

I hear you Brother, I also get a kick out of guys like mzungu.

I ask WC a question in which WC always gives me his honest answer without discrimination of my "knowledge of science". And then I am given a answer like the one quoted below. It further illustrates the legitimacy of my question to WC.

And your point being? I ask this because you have betrayed a total lack of understanding on how science works. Now since you are so keen on passing judgement on something you have no knowledge of then perhaps we should refer to Islam to explain Christianity for us?
 
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Wiccan_Child

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Seems when discussing or arguing any field of science, there is always a limit on how far the conversation can proceed without reaching the limit of that said field or being passed over to some other field of science.
Indeed. When discussing the fundamental properties of biochemical molecules, you invariably cross over from chemistry into physics.

Science is very compartmentalized. For instance Evolution, A Evolutionist will say well we can tell you how things evolve but not tell you from what everything evolved from and at what point did non life become life and how did that happen.
Not entirely. The theory of common descent posits the existence of a single organism that lived about 3.5 billion years ago, from which all modern life is ultimately descended (hence, 'universal common ancestor'). The evidence for evolution is primarily concerned with a) demonstrating common ancestry, and b) the proposed mechanics of evolution.

So, the evidence for evolution supports the existence of this common ancestor, even though the theory itself doesn't explain where it came from, or how it got there.

But, that doesn't mean there isn't another theory that tells us these things. Objecting to evolution because it doesn't explain the origin of that initial organism is moot, as we have another theory to tell us that very thing - abiogenesis.

I like to think of it as an overarching narrative. We start with the interstellar dust cloud that condensed to for the Sun, then the Planets, then the Moon formed, then the Earth cooled, then the oceans formed, then simple organic molecules formed, then life formed, then a plethora of taxa evolved, then humans evolved, then civilisation emerged, then the Internet was invented, and then I was able to talk to you.

This long chain of events isn't invalidated just because there are multiple theories from multiple fields contributing to it (cosmogony, geology, chemistry, biology (evolution, abiogenesis), sociology). Theories tend to 'hand off' to one another.

Big Bang same thing, science can explain the expansion but not the origin of the "little ball of energy" or what it exploded into.
Correct. The evidence is enough for us to be sufficiently certain the singularity existed, but there is, as yet, little evidence or theory to tell us where that singularity came from.

This trend continues into every subject and field. So my question is, is there a field of science that works on connecting all the dots and filling in the blanks from one theory to the next?
A new theory which connects two dots generally makes reference to hitherto established knowledge - abiogenesis, for instance, makes reference to the established conditions of prebiotic Earth and the conditions of post-biotic Earth. There isn't one single field that works on connecting the dots, but rather, gaps in scientific knowledge are worked on by scientists from every field - psychologists work on closing gaps in our knowledge of the mind, etc.
 
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sandwiches

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It always cracks me up when a geologist here will tell me about physics, a physicist will tell me about biology, and a biologist will tell me about geology.

Or a creationist tells us about evolution... Now THAT is comedy. :D
 
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Wiccan_Child

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It always cracks me up when a geologist here will tell me about physics, a physicist will tell me about biology, and a biologist will tell me about geology.
It's the great Baton Race of Science :p
 
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TerranceL

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It always cracks me up when a geologist here will tell me about physics, a physicist will tell me about biology, and a biologist will tell me about geology.

It's even funnier when a creationists tries to tell us anything about reality.
 
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Naraoia

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I did not! Just goes to show you that we rock :p
Or that you're rich :p

Seems when discussing or arguing any field of science, there is always a limit on how far the conversation can proceed without reaching the limit of that said field or being passed over to some other field of science.

Science is very compartmentalized. [...]

This trend continues into every subject and field. So my question is, is there a field of science that works on connecting all the dots and filling in the blanks from one theory to the next?
That every theory has its specific applicability is just how the world works. Within any explanatory framework, there are sub-explanations for sub-problems*. However, theories don't exist in isolation, they all connect to a larger whole. Science (as a body of ideas) is a bit like this**:

MEDIUM_1471-2105-7-386-3.jpg


For an example, consider the RNA world hypothesis, an idea that aims to explain how life as we know it began. Of course, this idea has ties to biology - perhaps no one would have thought of it if living things didn't use RNA to interpret their genetic information. It relies heavily on evolutionary theory to explain how primordial RNA molecules could have given rise to more complex genomes. Its details - and some of its problems - are determined by chemistry. Its context is given by the earth sciences. And all of that is underpinned by physics.

Science may consist of modules or compartments, but they are heavily interconnected.

*E.g. in Christianity (and I hope I don't get this completely wrong ;)), the story of the Fall (whether literal or allegorical) explains why we need saving, while Jesus's teachings explain how we can be saved. The overarching theme behind this all is the Christian God - but under that grand framework, smaller, semi-independent explanations are devised for various aspects of the world.

**The picture is a diagram of the metabolic network of E. coli, from this paper.
 
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Exiledoomsayer

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So I've got a probablity question.

A:
Suppose you play a game of dice, the idea is that you roll 1 20sided die and 1 30sided die, adding the results together to get a score. Then 2 30sided dice are rolled and its result is compared to yours. If you draw or score lower you lose.
What are the chances of winning this game and how would that be calculated?

B:
Same game, only now you get to roll 1 100sided die against 2 50sided dice. Do your chances improve and why?
 
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CaliforniaSun

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So I've got a probablity question.

A:
Suppose you play a game of dice, the idea is that you roll 1 20sided die and 1 30sided die, adding the results together to get a score. Then 2 30sided dice are rolled and its result is compared to yours. If you draw or score lower you lose.
What are the chances of winning this game and how would that be calculated?

B:
Same game, only now you get to roll 1 100sided die against 2 50sided dice. Do your chances improve and why?
God...




did...




it?
 
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Wiccan_Child

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So I've got a probablity question.

A:
Suppose you play a game of dice, the idea is that you roll 1 20sided die and 1 30sided die, adding the results together to get a score. Then 2 30sided dice are rolled and its result is compared to yours. If you draw or score lower you lose.
What are the chances of winning this game and how would that be calculated?

B:
Same game, only now you get to roll 1 100sided die against 2 50sided dice. Do your chances improve and why?
Bear with me while I do the sums... :p
 
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