The lonely science post thread

[farmerbarleymow]

lunar eclipse, for me anyway

Total Lunar Eclipse on 15–16 May 2022 – Where and When to See

Total lunar eclipse on 15–16 May 2022: Where and when is the Blood Moon visible and what will it look like? Visibility map, animation, and local times.

www.timeanddate.com

Pictures please.

 

[farmerbarleymow]

The Earth's core is going rusty.

Terrawatch: is Earth’s core going rusty?

Rusty bits on Earth’s core could explain how the atmosphere became oxygenated

www.theguardian.com

 

[WouldBe]

The Earth's core is going rusty.

Terrawatch: is Earth’s core going rusty?

Rusty bits on Earth’s core could explain how the atmosphere became oxygenated

www.theguardian.com

Wouldn't any water contained in sinking rocks boil off well before reaching the core?

 

[Signal 11]

New mission planned for 2026 to study domes on the Moon.

Over the course of 10 Earth days (one lunar day), Lunar-VISE will explore the summit of one of the Gruithuisen Domes. These domes are suspected to have been formed by a sticky magma rich in silica, similar in composition to granite. On Earth, formations like these need oceans of liquid water and plate tectonics to form, but without these key ingredients on the Moon, lunar scientists have been left to wonder how these domes formed and evolved over time.

NASA Selects New Instruments for Priority Artemis Science on Moon

Adding to the growing list of commercial deliveries slated to explore more of the Moon than ever before under Artemis, NASA has selected two new science instrument suites, including one that will study the mysterious Gruithuisen Domes for the first time.

www.nasa.gov

 

[farmerbarleymow]

The world's largest bacteria

Scientists discover world’s largest bacterium, the size of an eyelash

At about 1cm long, Thiomargarita magnifica is roughly 50 times larger than all other known giant bacteria

www.theguardian.com

 

[8ball]

This has to be my top headline of the week:

The tiny mites that have sex on our faces have a problem

The 0.3mm long organisms live deep in the pores of our faces but may be about to go extinct.

www.bbc.co.uk

 

[farmerbarleymow]

This has to be my top headline of the week:

The tiny mites that have sex on our faces have a problem

The 0.3mm long organisms live deep in the pores of our faces but may be about to go extinct.

www.bbc.co.uk

It's a great story to freak out the squeamish amongst us.

Insect face orgy.

 

[two sheds]

This has to be my top headline of the week:

The tiny mites that have sex on our faces have a problem

The 0.3mm long organisms live deep in the pores of our faces but may be about to go extinct.

www.bbc.co.uk

Topped even by this one

Skin Mites That Live On Every Person's Face Found To Have Anuses: Why This Matters

Demodex folliculorum, also known as the skin mite lives in our skin pores. It feeds off the sebum that is produced by our body to keep the skin naturally moisturised.

www.indiatimes.com

 

[8ball]

Topped even by this one

Skin Mites That Live On Every Person's Face Found To Have Anuses: Why This Matters

Demodex folliculorum, also known as the skin mite lives in our skin pores. It feeds off the sebum that is produced by our body to keep the skin naturally moisturised.

www.indiatimes.com

I prefer the first one because it wouldn’t have occurred to me to assume they don’t have anuses, but “I am on ur face fuckin’ mah honeyz” has a bit more immediate ick value.

 

[farmerbarleymow]

Topped even by this one

Skin Mites That Live On Every Person's Face Found To Have Anuses: Why This Matters

Demodex folliculorum, also known as the skin mite lives in our skin pores. It feeds off the sebum that is produced by our body to keep the skin naturally moisturised.

www.indiatimes.com

"bum sex on yer face"

 

[farmerbarleymow]

This is curious - sun exposure makes men, but not women, hungrier by increasing levels of ghrelin in their blood. Oestrogen blocks this effect in women.

Sunlight may trigger hormone that makes men hungrier, study suggests

Scientists find ghrelin levels rose in men’s blood after sun exposure, but oestrogen appears to block increase in women

www.theguardian.com

 

[gosub]

Major nuclear fusion milestone reached as ‘ignition’ triggered in a lab | Imperial News | Imperial College London

Ignition is a key process that amplifies the energy output from nuclear fusion and could provide clean energy and answer some huge physics questions.

www.imperial.ac.uk

What a day!

 

[farmerbarleymow]

 

[8ball]

Moles of red blood cells and coins and stuff feels a bit too abstracted to mean anything (to me).

And how did they miss doing a mole of moles? That seems bloody obvious.

 

[farmerbarleymow]

Moles of red blood cells and coins and stuff feels a bit too abstracted to mean anything (to me).

And how did they miss doing a mole of moles? That seems bloody obvious.

I always think of a mole as

 

[8ball]

I always think of a mole as

Yeah, and a mole of them would be massive.

 

[two sheds]

so a mole of rice is about 20,000 chessboards with 1 grain on the first square, 2 grains on the second square ...

 

[HAL9000]

I've known about the Apollo computer errors for sometime , 1201 and 1202. I didn't know that the programmer Don Eyles thought the landing should be aborted. But Eyles was not consulted because there was no time, the astronaunts needed an imediate answer to decide if the landing should continue so the flight controller in huston said Go.



To give you a modern perspective, airbus aircraft use a fly by wire system, so when the pilot moves the controls, the computer receives this informative and decides how to move the flight control surfaces. BUT this system cannot fail because bad things will happen. (there is an alternative option to vary the engine power, but its not a great alternative and tricky to land using this method).
I believe there are 3 computers in the flight control system, so if one fails the other 2 can take over..



Apollo implemented a fly by wire system using one computer, by modern standards using a tiny amount of computer processing power and memory.

 

[gosub]

We Just Found a 'Super-Earth' That Could Be an Ocean-Covered Water World

An exoplanet just 100 light-years from Earth appears to be the best candidate yet for a sloshy, water-covered ocean world.

www.sciencealert.com

 

[Epona]

Is anyone going to be watching the Artemis I launch tomorrow, or is it all a bit passé now?

 

[Koknbul]

Is anyone going to be watching the Artemis I launch tomorrow, or is it all a bit passé now?

I probably wont, something about a moon mission, not that interested !

 

[8ball]

I probably wont, something about a moon mission, not that interested !

Apparently in a decade or so they reckon they’ll be able to put a man up there.

 

[Koknbul]

Apparently in a decade or so they reckon they’ll be able to put a man up there.

Impossible !

 

[T & P]

Could someone explain to an idiot in basic terms escape velocity? I know what it means, but why can’t a rocket or any other vessel or craft travel into space at a lower speed regardless of fuel efficiency, provided it has enough fuel/ energy? To my simple mind it seems even weirder considering gravity is stronger the closer something is to the surface of the planet.

If a rocket has no trouble taking off and climbing vertically from sea level at a speed much lower than the required escape velocity, when both gravity and atmosphere are at their most impending, why couldn’t it continue its progress upwards at a steady speed of 2,000 kph? Surely with every second travelled the gravity pull and air resistance decreases?

 

[8ball]

Could someone explain to an idiot in basic terms escape velocity? I know what it means, but why can’t a rocket or any other vessel or craft travel into space at a lower speed regardless of fuel efficiency, provided it has enough fuel/ energy? To my simple mind it seems even weirder considering gravity is stronger the closer something is to the surface of the planet.

If a rocket has no trouble taking off and climbing vertically from sea level at a speed much lower than the required escape velocity, when both gravity and atmosphere are at their most impending, why couldn’t it continue its progress upwards at a steady speed of 2,000 kph? Surely with every second travelled the gravity pull and air resistance decreases?

Escape velocity is more like the speed you would need to hoof a football at to get it properly into space (as opposed to falling back down, or winding up in a high orbit or whatever).

Doesn’t apply to bodies with continual propulsion.

Was explained to me similarly to what I think you’ve had at one time, and it confused me too.

 

[Knotted]

I think escape velocity is something like this: The velocity that will give you the kinetic energy that is greater than the potential energy of falling from infinity. TBH that's just my guess though.

 

[farmerbarleymow]

I think of escape velocity as having enough speed to snap the invisible elastic band that is otherwise tethering you to the object you're on.

 

[Signal 11]

why couldn’t it continue its progress upwards at a steady speed of 2,000 kph? Surely with every second travelled the gravity pull and air resistance decreases?

The point is what happens when you cut the engine.

The gravitational pull does decrease with distance, so if you travel far enough, your 2000kph will be the escape velocity from that distance and you won't fall back.

How far would you have to travel? I make it about 2.5 million km (several times the distance to the Moon), which would take about 50 days at that speed.

(using back of fag packet, Escape Velocity and Earth)

ve = sqrt(2GM/d)
so distance = 2GM/v^2

2 * 6.67*10^-11 * 5.972*10^24 / (2000 * 1000 / 3600)^2
2581193952.00000000000005164452 (distance in meters)
last / (2000 * 1000 * 24)
53.77487400000000000000 (time to travel that distance in days)

 

[farmerbarleymow]

An interesting looking beast

Discovered in the deep: the incredible fish with a transparent head

The rare barreleye fish tracks its prey with extremely light-sensitive rotating eyes encased in a see-through canopy

www.theguardian.com

 

[Knotted]

If an unpowered object with no friction (and ignoring other objects) is travelling at escape velocity it should trace a parabola I would think.