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Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

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Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Happy Aphelion Day 2019!
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

joecct said:
Happy Aphelion Day 2019!
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Without thinking about it I'm surprised this isn't the longest day of the year in the Northern Hemisphere.
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Despite knowing next to nothing about chemistry, I am fascinated by specific energy.

<img src="http://greenecon.net/wp-content/uploads/2007/09/table1.jpg" height="300">

This is easily the most entertaining video I have ever seen that touches upon it.
 
Kepler said:
Despite knowing next to nothing about chemistry, I am fascinated by specific energy.

<img src="http://greenecon.net/wp-content/uploads/2007/09/table1.jpg" height="300">

This is easily the most entertaining video I have ever seen that touches upon it.
Click to expand...
I distinctly remember this revelation when taking MAE386 (Automotive Engineering) 26-odd years ago. In the overall calculation for fuel economy (miles per gallon), there are many very large numbers in the denominator. The *only* large number in the numerator (which therefor makes the result a reasonable number of miles per gallon that makes automobile travel viable) is the energy density of gasoline. It’s irreplaceable. Anything else will inherently be worse.
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

LynahFan said:
I distinctly remember this revelation when taking MAE386 (Automotive Engineering) 26-odd years ago. In the overall calculation for fuel economy (miles per gallon), there are many very large numbers in the denominator. The *only* large number in the numerator (which therefor makes the result a reasonable number of miles per gallon that makes automobile travel viable) is the energy density of gasoline. It’s irreplaceable. Anything else will inherently be worse.
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Uranium excepted.

The comparable value (kj/g) to those above for U235 is 79,390,000.00
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

I'm sure this will end well.

A Japanese stem-cell scientist is the first to receive government support to create animal embryos that contain human cells and transplant them into surrogate animals since a ban on the practice was overturned earlier this year.

Hiromitsu Nakauchi, who leads teams at the University of Tokyo and Stanford University in California, plans to grow human cells in mouse and rat embryos and then transplant those embryos into surrogate animals. Nakauchi's ultimate goal is to produce animals with organs made of human cells that can, eventually, be transplanted into people.

Until March, Japan explicitly forbade the growth of animal embryos containing human cells beyond 14 days or the transplant of such embryos into a surrogate uterus. That month, Japan’s education and science ministry issued new guidelines allowing the creation of human–animal embryos that can be transplanted into surrogate animals and brought to term.
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I think this is right about the point I cede the ground to younger minds. I understand where it's going and I get it, but I am an Old Man and your new ideas frighten and confuse me. Just let me go out on my ice floe and proceed as you were.
 
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Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Closer every day.

An international team of astronomers led by Cornell's Lisa Kaltenegger has characterized the first potentially habitable world outside of our solar system discovered by NASA's Transiting Exoplanet Survey Satellite (TESS).

Located about 31 light-years away, the super-Earth planet -- named GJ 357 d -- was discovered in early 2019 owing to TESS, a mission designed to comb the heavens for exoplanets, according to their new modeling research in the Astrophysical Journal Letters.

"This is exciting, as this is TESS's first discovery of a nearby super-Earth that could harbor life -- TESS is a small, mighty mission with a huge reach," said Kaltenegger, associate professor of astronomy, director of Cornell's Carl Sagan Institute and a member of the TESS science team.

The exoplanet is more massive than our own blue planet, and Kaltenegger said the discovery will provide insight into Earth's heavyweight planetary cousins. "With a thick atmosphere, the planet GJ 357 d could maintain liquid water on its surface like Earth, and we could pick out signs of life with telescopes that will soon be online," she said.
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Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Kepler said:
If you don't mind I'd love it if we kept this thread for real science and put stories about the morons on the Nice Planet or Religion threads.

But I am not the Thread Nazi.

Yet.
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I can move it.
 
So, remember that Israeli moon probe that crash landed back in April? And it was assumed to be just another hunk of metal littering the landscape?

Turns out, it was purposefully carrying "water bears" (Tardigrades) from Earth. Tardigrades are microscopic, eight legged animals, and are resiliant little creatures who can survive without food and water, even in space.

<img width=300 src=https://www.strangerdimensions.com/wp-content/uploads/2017/11/tardigrade-space-dust.jpg>
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

aparch said:
So, remember that Israeli moon probe that crash landed back in April? And it was assumed to be just another hunk of metal littering the landscape?

Turns out, it was purposefully carrying "water bears" (Tardigrades) from Earth. Tardigrades are microscopic, eight legged animals, and are resiliant little creatures who can survive without food and water, even in space.

<img width=300 src=https://www.strangerdimensions.com/wp-content/uploads/2017/11/tardigrade-space-dust.jpg>
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did the rest of the scientific community agree to that animal being put on the moon? Seems like a questionable thing to do when people are still trying to find more signs of life in places.
 
alfablue said:
did the rest of the scientific community agree to that animal being put on the moon? Seems like a questionable thing to do when people are still trying to find more signs of life in places.
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The Moon is downwind part of the time from Earth. All sorts of things get blown outward on the solar wind from here.
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Here's the link: (forgot it in my post) https://www.wired.com/story/a-crashed-israeli-lunar-lander-spilled-tardigrades-on-the-moon

Seems it was a last minute audible called by the Israeli launch team to include the DNA samples and Tardigrades as part of their "welcome message" for whomever in the cosmos found it.

NASA seems unconcerned because they haven't found anything from their Moon samples to support that life could survive on the Moon. They're more concerned with keeping Mars uncontaminated.

The Tardigrades are currently "dehydrated" but there is the possibility that contaminated samples could be returned to Earth or brought aboard spacecraft and re-hydrate.
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Nothing says amateur like a ****ing space-audibiling into planetary contamination.
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

joecct said:
The Moon is downwind part of the time from Earth. All sorts of things get blown outward on the solar wind from here.
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That's not the point- someone just put a known earth creature on the moon. Seems hardly a good idea.

And I'm not sure if any solar wind is taking stuff from the earth to the moon- I doubt there's enough energy to overcome both the atmosphere and gravity. Even if there was stuff, this particular thing would not be part of what got there.
 
alfablue said:
That's not the point- someone just put a known earth creature on the moon. Seems hardly a good idea.

And I'm not sure if any solar wind is taking stuff from the earth to the moon- I doubt there's enough energy to overcome both the atmosphere and gravity. Even if there was stuff, this particular thing would not be part of what got there.
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Too bad Sam Arkoff is dead. I can see a B movie horror film of a sample return mission bringing back a mutated Tardigrades and it starts to eat Houston.
 
Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Some good science news:
A Mexican Physicist Solved a 2,000-Year Old Problem
It’s a problem that plagues even the priciest of lenses, manufactured to the most exacting specifications: the center of the frame might be razor-sharp, but the corners and edges always look a little soft. It’s a problem that’s existed for thousands of years with optical devices, and one that was assumed to be unsolvable until a Mexican physicist developed a mind-melting formula that could revolutionize how lenses are manufactured.

On paper, a curved glass lens should be able to redirect all the rays of light passing through it onto a single target known as its focal point. But in the real world, it just doesn’t work that way. Differences in refraction across the lens, as well as imperfections in its shape and materials, all contribute to some of those light rays, especially those entering the lens near its outer edges, missing the target. It’s a phenomenon known as spherical aberration, and it’s a problem that even Issac Newton and Greek mathematician Diocles couldn’t crack.
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But that’s all going to change thanks to Rafael G. González-Acuña, a doctoral student at Mexico’s Tecnológico de Monterrey. After months of work, he managed to come up with a mind-melting equation that provides an analytical solution for counteracting spherical aberration, which had been previously formulated back in 1949 as the Wasserman-Wolf problem which stumped scientists for decades.
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Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

Re: Science: Everything explained by PV=nRT, F=ma=Gm(1)•m(2)/r^2

aparch said:
Some good science news:
A Mexican Physicist Solved a 2,000-Year Old Problem
Click to expand...

Hopefully he's smart enough to not share that improvement with any US company, as they are likely to patent his idea, and then sue him and deport him to some country even farther south....

For the less cynic- this is why diversity is a good thing. We, as a society, are better off when we cast the widest net possible to find people to solve problems.
 
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