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How methane is created and destroyed on Mars is an important question in understanding the various detections and non-detections of methane at Mars, with differences in both time and location. Although making up a very small amount of the overall atmospheric inventory, methane in particular holds key clues to the planet’s current state of activity.
This graphic depicts some of the possible ways methane might be added or removed from the atmosphere.
One exciting possibility is that methane is generated by microbes. If buried underground, this gas could be stored in lattice-structured ice formations known as clathrates, and released to the atmosphere at a much later time.
Methane can also be generated by reactions between carbon dioxide and hydrogen (which, in turn, can be produced by reaction of water and olivine-rich rocks), by deep magmatic degassing or by thermal degradation of ancient organic matter. Again, this could be stored underground and outgassed through cracks in the surface. Methane can also become trapped in pockets of shallow ice, such as seasonal permafrost.
Ultraviolet radiation can both generate methane – through reactions with other molecules or organic material already on the surface, such as comet dust falling onto Mars – and break it down. Ultraviolet reactions in the upper atmosphere (above 60 km) and oxidation reactions in the lower atmosphere (below 60 km) acts to transform methane into carbon dioxide, hydrogen and water vapour, and leads to a lifetime of the molecule of about 300 years.
Methane can also be quickly distributed around the planet by atmospheric circulation, diluting its signal and making it challenging to identify individual sources. Because of the lifetime of the molecule when considering atmospheric processes, any detections today imply it has been released relatively recently.
But other generation and destruction methods have been proposed which explain more localized detections and also allow a faster removal of methane from the atmosphere, closer to the surface of the planet. Dust is abundant in the lower atmosphere below 10 km and may play a role, along with interactions directly with the surface. For example, one idea is that methane diffuses or ‘seeps’ through the surface in localized regions, and is adsorbed back into the surface regolith. Another idea is that strong winds eroding the planet’s surface allows methane to react quickly with dust grains, removing the signature of methane. Seasonal dust storms and dust devils could also accelerate this process.
Continued exploration at Mars – from orbit and the surface alike – along with laboratory experiments and simulations, will help scientists to better understand the different processes involved in generating and destroying methane.
Credits: ESA
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recropped (crop suggested by flopper). Thanks Sean!
This is Dry Falls which is located in North Carolina. The walk behind dry falls was anything but dry! This photo was taken with a 1/4 second exposure.
I make no apology for uploading some more views of Tarn Hows - a much photographed scene, including by me. This may be a popular viewpoint but I never tire of the view and can't resist taking a few more shots, especially on a day as clear as this.
Another shot from the same spot below.
“My Hero Book,” Book Five of the How and Why Library edited by George W. Diemer with contributing editor Claude Merton Wise. Published by The L. J. Bullard Co., in Cleveland, Ohio. Copyright 1945.
On Saturday 18 May, the 14th national rally since October 2023 was organised by the Palestine Solidarity Campaign and other groups, and possibly as many as 250,000 protesters marched across central London from Mortimer Street W1 (near the BBC headquarters at Broadcasting House) to Whitehall, just a few metres away from prime minister Rishi Sunak's office and residence at 10 Downing Street.
It is difficult to estimate the total number of demonstrators but I stopped on Regent Street to photograph individuals and groups, and it took at least an hour for the majority of the marchers to pass.
Many of those participating did so in part to commemorate Nakba Day, the 76th anniversary of which fell three days earlier on 15 May. Nakba Day commemorates the brutal ethnic cleansing and expulsion of 750,000 Palestinians from their homes and villages in the months after 15 May 1948 by the Israeli army and Zionist militia. Although historians point out that the ethnic cleansing of Palestinians from their land long predated 15 May 1948, and has continued ever since.
Many of the protesters carried the iconic "Keys of Return," symbolising the right of Palestinian refugees to return to their original homes, which was recognised by The United Nations UN General Assembly Resolution 194 which was passed on December 11, 1948.
Protesters were also demanding an immediate ceasefire, an immediate resumption and expansion of emergency aid and an end to the siege of Gaza and the illegal Israeli Occupation.
The march occurred just two days before the International Criminal Court's (ICC's) lead prosecutor, Karim Khan, announced that arrest warrants for war crimes had been requested for Israel's prime minister Benjamin Netanyahu and Defence Minister Yoav Gallant. It was Gallant who in October 2023 infamously justified his declaration of a "complete siege " on Gaza by claiming Israel was "fighting against human animals."
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A creative commons PHOTO LICENSE for COMMERCIAL USE for this photo is AVAILABLE for over sixty NGOs and socialist or progressive publications which are listed on the link below
Although this image is being posted on an attribution noncommercial share alike basis CC BY-NC-SA 2.0 DEED, the following organisations and publications listed on the link below are also welcome to reproduce it even if it is for commercial purposes. However please publish the image on the same attribution noncommercial share alike basis. For more info or if any other organisation or other publication wishes to publish this photo on a commercial basis please email me at alisdare@gmail.com.
How cute is this Globefish!! and amazingly it's all hand sewn! no sewing machine.
Very unique design, definitely love to have this in your bag!
It's made by Japanese fabrics including Kimono fabric.
Perfect size for cosmetics :)
L 17cm (mouth to tail 20cm) x H 10cm x W 7cm(bottom)
This is made by my neighbor(in Japan) Mrs Kinoshita.
Best Gospel Song | How Great Is Our God | " How God Rules Over All Things"
From the moment you come crying into this world,
you begin to perform your duty.
In the plan and ordination of God, you assume your role,
and begin the journey of life.
Whatever your background or the journey ahead of you,
none can escape the orchestration and arrangement that Heaven has in store,
and none are in control of their destiny,
for only He who rules over all things is capable of such work.
Since the day man came into existence,
God has been steady in His work,
managing this universe and directing the change and movement of all things.
Like all things, man quietly and unknowingly
receives
the nourishment of the sweetness and rain and dew from God.
Like all things, man unknowingly lives under the orchestration of God’s hand.
The heart and spirit of man are held in the hand of God,
and all the life of man is beheld in the eyes of God.
Regardless of whether or not you believe this,
any and all things, living or dead,
will shift, change, renew, and disappear according to God’s thoughts.
This is how God rules over all things.
from The Word Appears in the Flesh
recommenda to you: praise and worship music
www.washingtoncitypaper.com/arts/museums-galleries/blog/2...
“How Not To Be Seen: A Fucking Didactic Educational .MOV File” (2013) by Hito Steyerl is a work of sustained intensity: a kaleidoscopic essay on cinematic editing, aerial photography, and facial-recognition technology. It’s also a love-note to falling into a very particular kind of YouTube hole: luxury apartment development architectural demo videos.
observer.com/2017/12/curator-mark-beasley-highlights-vide...
Hito Steyerl How Not to Be Seen looks at how video surveillance and monitoring is shaping contemporary life.
www.flickr.com/photos/anokarina/40006366234/in/album-7215...
How these rails haven't given way yet in these sidings is beyond me.... anyway leaning all over the show 60001 & 60039 frozen at Peak Forest 09/01/2019
“I am both happy and sad at the same time, and I'm still trying to figure out how that could be.”
― Stephen Chbosky, The Perks of Being a Wallflower
Howards Travel Group F15 HOW Enviro 300.
This vehicle was formerly BX05FPV (B10 JYM) with Jim Stones, Leigh and originally new to British Telecom for use at Goonhilly Downs Satellite Earth Station in Cornwall.
Seen here looking very smart whilst operating a rail replacement service for Northern Rail on Sheffield Street, Manchester 12/06/16.
52 weeks of Music and Blythes/Dolls
"How do you solve a problem like Maria?
How do you catch a cloud and pin it down?
How do you solve a problem like Maria?
A flibbertigibbit? a wil 'o the wisp? a clown?
Many a thing you know you ought to tell her,
Many a thing she ought to understand,
But how you make her stay,
and listen to all you say
How do you keep a wave upon the sand?
How do you solve a problem like Maria?
How do you hold a moonbeam in your hand?"
from 'The Sound of Music"
A short series of photos showing how to put this together, as per a request. Please note this is simply my interpretation of the limited data available in the movie poster.
I have no idea how close I am to how the actual model was put together. Colors may vary.
TELL ME HOW IM SUPPOSED TO BREATHE WITH NO AIR
CANT LIVE, CANT BREATHE WITH NO AIR
ITS HOW I FEEL WHENEVER YOU AINT THERE
ITS NO AIR, NO AIR
GOT ME OUT HERE IN THE WATER SO DEEP
TELL ME HOW YOU GONNA BE WITHOUT ME
IF YOU AINT HERE, I JUST CANT BREATHE
ITS NO AIR, NO AIR
Better see on black and big format
See my slideshow video of autumn : www.youtube.com/watch?v=U_i-CDPxoQ8
"How can I go forward when I don't know which way Im facing?
How can I go forward when I don't know which way to turn?
How can I go forward into something I 'm not sure of?
Oh no, oh no.
How can I have feeling when I don't know if it's a feeling?
How can I feel something if I just don't know how to feel?
How can I have feelings when my feelings have always been denied?
O oh no, oh no.
How can I give love when I don't know what it is Im giving?
How can I give love when I just don't know how to give?
How can I give love when love is something I ain't never had?
Oh no, oh no.
You know life can be long
And you got to be strong
And the world is so tough
Sometimes I feel I've had enough.
Oh no, oh no.
How can we go forward when I don't know which way we're facing?
How can we go forward when we don't know which way to turn?
How can we go forward into something we're not sure of?"
How? by John Lennon
he would be if he were to stay with me. :(
I decided not to keep this guy because his body drives me nut. It's very hard to do any harder poses than standing up and sitting down. Which is really too bad cause I adore his face and he has so much potential >___<;;
(This wig was intended for him and it looks so good on him ;3 ;)