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Science!

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Discussion Forum

The Origin of Life Is Among Many Atheists’ Interests. If It Is Among Yours, ...

Started by Tom Sarbeck Jan 9. 0 Replies

...if the origin of life is among your interests, go to www.youtube.com and on its search bar enter “electricity of life”.You will see links to short videos telling of recent research into this question. One of…Continue

Tags: electricity, universe, earth, origin, life

The Denisova genome

Started by Adriana. Last reply by Tom Sarbeck Apr 23, 2017. 7 Replies

Remember the 40,000 year-old Denisova finger bone that yielded sufficient DNA to…Continue

Tags: evolution, human, genome, DNA, hominin

Do You Need The Universe To Have Had A Beginning?

Started by Tom Sarbeck. Last reply by Tom Sarbeck Nov 19, 2016. 31 Replies

Many if not all human societies have origin myths and they differ greatly.Several years ago a San Francisco-born-and-raised woman told me she is a materialist.An hour ago a woman who was raised a Jehovah Witness and has left that faith told me the…Continue

Tags: cosmology, cosmogeny, evidence, need, universe

Florida schoolgirl charged with felonies for science experiment

Started by Neal. Last reply by Chris Sep 27, 2016. 3 Replies

No science for you woman! Photo: FreeLearningLife - FlickrWednesday, May 1, 2013 -…Continue

Tags: felony, a, becomes, experiment, science

Mandating Scientific Discovery Never Works But politicians can’t seem to grasp that.

Started by Neal. Last reply by Chris Aug 31, 2016. 4 Replies

GOP decides that research should be legislated. Usual nonsense.By Lawrence Krauss|Posted Friday, June 21, 2013, at 7:30 AM…Continue

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Science Bits, News, Videos

Started by Adriana. Last reply by Tom Sarbeck Aug 24, 2016. 1364 Replies

This discussion is to have a recurrent thread for science news, tidbits, quick…Continue

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Tully Monster

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Solving the mystery of the Tully MonsterPosted: 16 Mar 2016 12:13 PM PDTThe Tully…Continue

Super weeds in the US

Started by Davy. Last reply by Chris Aug 18, 2014. 1 Reply

New York (AFP) - The United States is facing an epidemic of herbicide-resistant "superweeds" that some activists and researchers are blaming on GMO's, an accusation rejected by industry giants.According to a recent study, the situation is such that…Continue

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Platypus Godzilla.

Started by Davy. Last reply by Davy Nov 20, 2013. 5 Replies

And you thought the platypus was a nice, cuddly little monotreme. You would not have thought so 5 to 15 million years ago. Palaeontologists have uncovered the fossil of a platypus that looks as though it is on steroids.  The platypus dub the…Continue

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Aussie algae fuel green oil hope

Started by Davy Oct 20, 2013. 0 Replies

Aussie algae fuel green oil hopeDespite the claims of some, commercially viable fuels from algae have not yet been developed. But newly trialled native algae species provide real hope, a Queensland scientist has found.Dr Evan Stephens and the team…Continue

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Comment by Anti_Doone on March 26, 2011 at 12:21pm
Comment by Anti_Doone on March 26, 2011 at 7:56am

How Hydrogen teaches us about the temperarature of dark matter from Starts with a Bang

 

Guess what? That tells you something about your dark matter! Because if you want to make something that's dense and collapsed, it can't be moving too quickly. In astrophysics, if you're moving quickly, we call you hot, and if you're moving slowly, we call you cold.

large_scale_structure.gif

For dark matter, the cosmic microwave background doesn't care whether you're hot or cold. But structure does, and the Lyman-alpha forest is very sensitive to it! If dark matter were hot (or even if it were too warm), the forest would be too shallow; in other words, hot dark matter makes it too hard to form small-scale structure at early times.

But we see the evidence of this small-scale structure directly in the Lyman-alpha forest! What does this tell us?

dm.gif

(Image credit: Benedetta Ciardi.)

It tells us that dark matter can be WIMPs (like from supersymmetry), because they're too massive to move quickly, or they can be particles that are born cold, like axions or (some) sterile neutrinos, because they started off moving slowly. But they can't be regular neutrinos or hot sterile neutrinos, among others, because this small-scale structure -- and hence the hydrogen lines that we see -- would get washed out at early times!

So just like that, from looking at hydrogen, we can tell how cold our Universe's dark matter has to be. And that's how hydrogen teaches us the temperature of dark matter

Comment by Anti_Doone on March 25, 2011 at 11:59pm

Wave_group.gif


Wave_group.gif


Wave_group.gif


Comment by Neal on March 25, 2011 at 6:17pm
no pun intended; maybe. =)
Comment by Neal on March 25, 2011 at 6:15pm
@DG: lmao!
Comment by Neal on March 25, 2011 at 6:14pm

That, or the more destructive, Ares.

 

Slight derail, myths were fun reading. Good fiction and treated as such in the public schools. They should have included christianity in the myth part of my education. 

 

Might be a blog here. =)

Comment by A Former Member on March 25, 2011 at 6:12pm
No, god is from Uranus.
Comment by Anti_Doone on March 25, 2011 at 6:08pm
This God is from Mars or is Mars
Comment by Neal on March 25, 2011 at 6:00pm
So, god is from mars?
Comment by Anti_Doone on March 25, 2011 at 5:48pm

From Smart Planet

Are we all Martians? There’s a DNA test for that.

Scientists think it’s possible that life originally came from Mars, possibly carried here by meteorites. If that’s the case, then life on Mars might have genetic similarities to life here on Earth.

MIT researchers are building a tool that might provide DNA evidence that could back up this radical theory.

In order to test Martian soil for DNA or RNA evidence, the researchers are building a prototype device called Search for Extra-Terrestrial Genome (SETG). But it won’t be completed for a couple of years.

 
 
 

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