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  #1176  
Old 10-01-2018, 03:46 PM
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Default Re: Drive by science


Perseid Meteor impact, that or the empire has found the rebel base!
Credit Photographer Petr Horálek

Hypersonic atmospheric reentry causes the compression of gasses in front of the object rapidly heating them up. This is why instead of slowly burning away it appears the meteor hits a wall or space shield. (Compression (and not friction) causing the majority of reentry heat is also why reentry vehicles are pretty blunt allowing for the compression to take place as far in front as possible, leaving a decompressing and thus cooler skin of air around most of the vehicle.) The gas after the the explosion is called a 'persistent train' and is thought to be ionized atmospheric gas slowly recombining with electrons and can persist for quite awhile after the meteor is gone. The vortex ring could have been created by a couple different means, but it mostly means the altitude where the meteor vaporized had pretty calm airflow in comparison to the meteor and atmospheric gasses that it turned to plasma.
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  #1177  
Old 10-01-2018, 10:20 PM
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Bigfoot and beyond: Why tales of wild men endure - CSMonitor.com

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The image of a big hairy humanoid hiding in the wilderness appears not just in movies like “Harry and the Hendersons” and the animated film “Smallfoot,” which premieres on Friday, but also in cultures all over the world. Visitors to the mountains of the Chinese province of Hubei report sightings of the Yeren, or “wild man,” who dwells in the forest. In Cameroon, the fearsome Dodu is said to dine on grubs. The Mapinguari stalks the rainforests of Brazil and Bolivia; the Yowie walks about the Australian outback. In Russia’s Sakha Republic, it’s the Chuchunya, and in the Caucasus and Pamir Mountains of Central Asia, it’s the Almas.
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Old 10-01-2018, 10:37 PM
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Default Re: Drive by science

+1 thanks for being interesting
-1 thanks for no actual science
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  #1179  
Old 10-01-2018, 11:54 PM
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But it's in the Science section of the Christian Science Monitor! Double science!
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  #1180  
Old 10-02-2018, 02:16 AM
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What a Beetle’s Genital Worms Reveals About the Concept of Individuality

I know you're intrigued now. You won't be disappointed if you go read it.
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  #1181  
Old 10-05-2018, 05:10 PM
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  #1182  
Old 10-11-2018, 05:34 AM
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I read some of your foolish scree, then just skimmed the rest.
 
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Gravitational waves provide evidence gravity exists in 3 dimensions.
I tried to give that a well duh title because sometimes things that seem obvious or stupid science are more interesting then they seem.

One of the big questions in particle physics is why is gravity so immensely more weak than all the other forces. So so much weaker, like a gajillion jillion jillion times weaker than any of the other forces. One hypothesis was that gravity wasn't actually that much weaker and that if instead it had the property to leak into another dimension and really exist in 4 or more dimensions of space that its affect on the 3 dimensions we exist in would be much weaker so as to give it the appearance of being so weak.

Since the discovery of gravitational waves our ability to study gravity has increased and a recent, to us, neutron star collision in another galaxy allowed for both the light and the gravity to be detected from the collision at the same time. Astronomers used the energy of the collision based on the understanding of the light produced to calculate the energy expected this far away depending on a 3 dimensional or 4 dimensional gravitational wave. Turns out the expected energy matched very well with 3 dimensions suggesting that gravity isn't leaking over into a 4th dimension after all. At least over distances of 100 million light years gravity is a 3 dimensional force.
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  #1183  
Old 10-11-2018, 09:28 AM
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Quote:
Originally Posted by Ari View Post
At least over distances of 100 million light years gravity is a 3 dimensional force.
Well it's a start.
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  #1184  
Old 10-14-2018, 06:20 AM
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Default Re: Drive by science


http://freefall.purrsia.com/default.htm
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  #1185  
Old 10-15-2018, 02:13 AM
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After lementing finding so many exterminator sites when trying to identify a new spider on my balcony, a friend mentioned the iNaturalist app.

It's a rather cool app that is designed to crowdsource species data, location and movements. The idea is you sign up and can either browse observed species in different areas marked on a map or upload your own images which can be identified by others. I've learned the names of multiple plants in my area and plan to upload species sightings when I get a chance.
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  #1186  
Old 10-16-2018, 04:04 AM
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  #1187  
Old 10-16-2018, 04:22 AM
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Default Re: Drive by science

In case there's any doubt, that's a hoary old urban legend with always changing characters.
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  #1188  
Old 10-16-2018, 08:52 PM
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Default Re: Drive by science

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In case there's any doubt, that's a hoary old urban legend with always changing characters.

FACT CHECK: Einstein Switches Places with His Chauffeur


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Albert Einstein
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a famous preacher of Dubno
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a benefits specialist in the Marines
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The Pope
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Lasorda
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  #1189  
Old 10-17-2018, 02:02 AM
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So a care package from my mom to my sister in the next city, I'm sending it, I pop it open to pack it better.


Sizes of objects as they actually turned out seemed on average larger, except the cell phone wrist watches. Porn and aging eyes probably dictates screen size. Some of it was pretty close. Except the 2020 Lunar Olympics.


Mostly kid friendly up to the 70s history of space flight with some futurism.

Handing these with pride off to my niece and nephew.
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  #1190  
Old 10-18-2018, 03:26 AM
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I've probably explained this before, but I thought this was a great example of how a spider web works.

The green is a dry powdered paint that I blew onto the webbing. You can see that it stuck mostly to the spiral webbing and barely if at all to the radial web and the center web. The radial webbing is what the spider runs along and the center is where it sits to detect the location of the captured prey. The spider will keep a foot on the one radial spoke that has no spiral attached to detect vibrations, once something is detected it will run to the center where it will pluck the different radial strings to find the heavy one and home in on the captured prey, both the spokes and the center are left unsticky for fast movement. The patchwork in the center is said to be species specific and may be used by spiders to tell if they've wandered onto a potential mates web or might be a potential snack.

You can also see why a spider needs to remake it's web every so often as the sticky spiral webbing can stick to itself and become less useful as seen on the left where the blowing and weight of the powder caused multiple strands to stick together.

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  #1191  
Old 11-01-2018, 02:24 AM
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  #1192  
Old 11-01-2018, 10:29 AM
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Default Re: Drive by science

Great, now I want caffeinated sandwiches.
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Old 11-12-2018, 04:33 AM
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The sounds of a Martian sunrise inspire short musical composition | Ars Technica

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  #1194  
Old 12-01-2018, 01:01 AM
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More spiders.

Scientists discover spider species that feeds its young milk | World news | The Guardian

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The newly hatched spiderlings were found to be entirely dependent on nutritious spider milk, containing nearly four times the protein of cow’s milk, secreted and fed to them by their mothers.
...

The spider mothers continued to care for and feed their offspring for nearly 40 days, long after they were able to forage on their own and almost until the point of sexual maturity.
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  #1195  
Old 12-10-2018, 03:58 PM
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The sky on Earth is blue, and sunsets are orange.

But on Mars the sky is orange ... and sunsets are blue:



Of course human eyes have not yet been delivered to Mars to report what colours actually appear. The orange colour is due to dust - when (rarely) there's no dust, it's dark blue to black. The blue glow around the sun is less clear, something to do with how the dust scatters shorter vs longer wavelengths differently.

What color is the sky on Mars? - Serious Science

Lots of interesting stuff at that site.
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  #1196  
Old 12-11-2018, 08:59 PM
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Via APOD: 2018 December 8 - Tiny Planet Timelapse:


It's just under 3m long. From 1:32 to 2:20, the images are projected so the stars are fixed (even that bright one close to us, in this short 24h timescale), and the earth rotates (as it does). It's pretty neat.
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  #1197  
Old 12-11-2018, 10:13 PM
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