Awyrfeini Cymru
Yn yr Adran Ddaeareg y mae'r eitemau hynaf yn Amgueddfa Cymru. Y ffosilau yw'r eitemau mwyaf cyffredin yno, yn amrywio o ryw 550,000,000 o flynyddoedd oed i ychydig dros 10,000 oed.
Fodd bynnag, mae un grŵp o eitemau gryn dipyn yn hŷn na'r ffosilau hynaf ac, yn wahanol i'r ffosilau, nid o'r Ddaear y maent yn dod, ond o'r gofod.
Syrthiodd llawer o'r eitemau hyn o'r gofod a glanio mewn gwledydd pell o Gymru ond fe welwyd un, sydd o ddiddordeb arbennig i ni, yn syrthio i'r ddaear yn y gogledd.
Goleuadau llachar a llechi'n chwalu
Yn oriau mân y bore ar 21 Medi 1949, gwelodd llawer o bobl yng ngogledd Cymru a Swydd Gaer olau llachar yn symud yn gyflym yn yr awyr. Am 1.45am clywodd rhywun oedd yn aros yng Ngwesty'r Prince Llewelyn, Beddgelert gyfres o gleciadau marwaidd. Yna, bu tawelwch am dair neu bedair munud ac yna sŵn sïo fel awyren fechan a aeth yn gryfach ac yn gryfach hyd nes iddo glywed sŵn llechi to yn chwalu.
Deffrwyd rheolwr y gwesty gan gyfarth ei gi a chlywodd sŵn bangio afreolaidd ond aeth yn ôl i gysgu. Fore trannoeth, daeth ei wraig o hyd i dwll garw yn nenfwd lolfa i fyny'r grisiau, a phlastr a charreg dywyll tua maint pêl griced ar y llawr. Ni wyddai'r rheolwr na'i wraig beth oedd hyn nac a oedd cysylltiad rhyngddo a'r synau a glywodd ef yn y nos. Yn y bar y noson honno, dywedodd hen fwynwr a oedd wedi gweld awyrfeini mewn amgueddfa mai dyna oedd y garreg hon. Yn ddiweddarach, gwelwyd bod twll crwn, taclus yn llechi to'r gwesty.
Awyrfeini
Peth naturiol sy'n syrthio i'r Ddaear o'r gofod yw awyrfaen. Wrth deithio trwy'r atmosffer, mae'r haenau allanol yn cael eu poethi gan ffrithiant ac felly mae'n disgleirio ac yn edrych yn debyg i seren wib. Gall awyrfeini syrthio yn unrhyw le, unrhyw bryd, ond mae'n annhebygol iawn, iawn y cewch eich taro gan un (diolch byth!).
Dim ond un awyrfaen arall y gwyddom iddo syrthio yng Nghymru — ym Mhontllyfni, ger Caernarfon ym 1931. Credir bod y rhan fwyaf o awyrfeini'n dod o gwmwl o bethau creigiog bychan a elwir yn Wregys Asteroidau, sydd rhwng cylchdroeon planedau Mawrth ac Iau yng nghyfundrefn yr haul. Weithiau, mae rhai'n taro'i gilydd neu'n cael eu tynnu gan rymoedd disgyrchiant ac mae eu cylchdro'n newid gan olygu eu bod yn taro'r Ddaear.
Mae bron pob awyrfaen y daw pobl o hyd iddynt yn cael eu rhoi i wyddonwyr i'w harchwilio a'u dadansoddi, ond mae'n debyg bod awyrfaen Pontllyfni wedi cael ei gadw o dan wely rhywun am dros ddeugain mlynedd cyn cyrraedd yr Amgueddfa Astudiaethau Natur yn Llundain!
Cafodd awyrfeini Beddgelert a Phontllyfni eu harchwilio trwy gael eu torri'n ofalus a rhannu'r darnau rhwng gwahanol amgueddfeydd, prifysgolion a sefydliadau ymchwil. Felly, mae Amgueddfa Cymru'n ffodus bod gennym ddarn bychan o awyrfaen Beddgelert a syrthiodd i'r Ddaear ym mis Medi 1949. Fe'i gwelir yn yr arddangosfa Esblygiad Cymru yn Amgueddfa Genedlaethol Caerdydd.
Creigiau o'r gofod yn hŷn na'r Ddaear
Trwy ddyddio isotopau ymbelydrol o elfennau cemegol yn yr awyrfeini, penderfynwyd bod y rhan fwyaf ohonynt, yn cynnwys rhai Beddgelert a Phontllyfni, tua 4,560,000,000 o flynyddoedd oed. Mae hyn yn debyg i oed tebygol y Ddaear a gweddill cyfundrefn yr h. Mewn cymhariaeth, credir bod y creigiau hynaf y gwyddom eu bod wedi'u ffurfio ar y Ddaear ei hunan tua 3,800,000,000 oed (yng Nghymru, tua 700,000,000 oed yw'r creigiau hynaf).
Am y rheswm hwn, mae awyrfeini o ddiddordeb ac o bwysigrwydd mawr wrth astudio hanes cynharaf y Ddaear a chyfundrefn yr haul. Maent yn rhoi cliwiau i ni am eu cyflwr cyntefig a sut y cawsant eu ffurfio.
Mae un dosbarth neilltuol o awyrfeini y ceir enghraifft ohonynt yng nghasgliadau'r Amgueddfa (ond nid un Beddgelert), yn cynnwys cemegau a gynhyrchwyd wrth i sêr enfawr ffrwydro; mae'r rhain yn cynnwys samplau o rai o'r elfennau cemegol sy'n ffurfio 'blociau adeiladu' bywyd ac y datblygodd pob math o fywyd — yn cynnwys ni ein hunain — ohonynt yn y pen draw.
Ydych chi wedi gweld pelen dân / wedi darganfod rhywbeth allai fod yn feteoryn?
Ydych chi gweld wedi pelen dân?
Wedi darganfod rhywbeth allai fod yn feteoryn?
Cysylltwch â Ni gydag Ymholiadau Cyffredinol | Museum Wales (amgueddfa.cymru)
sylw - (11)
MY QUESTION IS AS I WAS HALF WAY UP TH HILL / ROAD LEAVING BROAD HAVEN I STOOD IN AMZMENT AS THS MASSIVE METIORITE OR FIRE BALL I MEAN MASSIVE I WAS STOOD OVER LOOKING BROAD HAVEN ACROSS TH HARBOUR TO THIS MASSIVE WHITE UP FRONT AND THEN TRURNING FROM RED TO A MASSIVE BLUE CENTER AND BLUE TAILED BURNING METEORITE FLY ACROSS TH SKY IT WAS AT A DISTANCE OF LIGHTING UP TH OTHER SIDE OF TH LAND OVER TH HOLE HARBOUR THS THING MUST HAVE BEEN SEEN BY SUM1 WITHING A 50MILE REDUS IT WAS SO BIG AND LITE UP EVERYTHING I HAD 1 OR 2 BEERS BIT NOTHING ELSE THS THING MUST HAVE BEEN SEEN BY SUM1 ELSE EVEN IF THY DIDNT SEE IT FROM TH BROAD HAVEN AREA IT WAS SO BIG AND LITE UP THE SKY & I CAN REMBER IT TO THS DAY BUT FROM TH ANGLE I WAS WATCHING THS FROM IT LOOKED LIKE IT WAS HEADING STRAIGHT 2WARDS TEXACO OIL REFINERY BUT WAS TRAVELLING ACROSS CASTLE MARTIN ARTILLERY RANGE SUM1 OUT THER MUST HAVE SEEN THS METIOR IT WAS SO BIG AND TH WHITE TO A BIT RED TO MASSIVE TURQUOISE BLUE CENTER TO TAIL ANYWAY IF ANY1 ELSE DID SEE THS METIORITE THY WILL KNOW EXACTLY WHAT I,M ON ABOUT BCUZ I CAN REMBER IT BEING SO BIG AT A REALY REALY FAR DISTANCE BUT TH LAST I CAN REMBER IT LOOKED AS IF IT WAS GOING TO TAKE OUT TEXACO OIL REFINERY FROM WERE I WAS STOOD WATCHING THS AND WHILE I CAN REMBER THINKING THS IS TH END BCUZ FROM MY ANGLE OF VEIW IT DID LOOK LIKE IT WAS HEADING FOR TEXACO REFINERY BUT IT OBVIOUSLY DIDNT COME CLOSE TO TH REFINERY BCUZ TH SIZE OF THS METIORITE WE WUDNT BE HERE 2DAY IF ANY OF THS MASSIVE METIORITE HAD HIT A SMALL BIT OF TH REFINERY BUT IT MIGHT HAVE BEEN MASSIVE BUT AT THT KINDA ANGLE IN TH SKY THT IT BROKE THROUGH OUR ATSMOPHER THT IT LOOKED LIKE IT WAS GOING TO HIT EARTH SUMWERE I WUD SAY WITHING A 100MILE REDUS IT WAS THT BIG BUT THER WAS NEVER EVER ANYTHING SAID ABOUT THIS THING EVEN ENTERING OUR ATMOSPHERE LET ALONE HITTING EARTH ANYWERE BUT THS WASNT CLOSE UP AND THS WAS FAR FAR FAR FROM ANY SHOOTING STAR,S IVE SEEN ANYWAY I HAVE GOOGLED ALSORTS AND HAVE NEVER FOUND ANYTHING ABOUT THS MASSIVE METIORITE THT WAS SO BIG THT IT HAS TO HAVE BEEN SEEN BY SUM1 OTHER THAN ME EVEN IF TH ANGLE I WAS LOOKING FROM WAS TOTALY WRONG TRODECTORY BCUZ FROM WERE I WAS STOOD THIS WAS HEADING OVER LAND AND SHUD HAVE HIT TH TEXACO OIL REFINERY BUT FOR SUM RESON IT MUST HAV TRAVELED AT A DIFFERENT LINE BUT FROM MY VEIW OF THS MASSIVE METIORITE ITS WAS LIGHTING UP TH CASLE MARTING LAND BELOW IT BUT LIKE I SAID I HAV NEVER HEARD ANYTHING ABOUT THS METIORITE AND THER IS NO WAY IT HIT TH EARTH AT ANYTIME BCUZ OF TH SIZE OF IT IT WUD HAV LEFT 1 HELL OF AN IMPACT CRATOR OR TOOK OUT TH AREA OF MILFORD HAVEN AS IT WAS HEADING FOR TEXACO REFINERY FROM WERE I WAS STANDING AT TH TIME THS IS TH STRANGE PART BUT UN MY EYES IT WAS GOING TO HIT TH REFINERY BUT AS IT WAS ABOUT TO I CAN REMBER JUST COMING AROUND IN MY BEDROOM AT HOME TH NXT DAY CAN ANY1 ELSE PLEASE VERIFY THS MASSIVE COMIT METIORITE WAT EVER IT WAS THER IS NO WAY ON THS PLANET THT I WAS TH ONLY PERSON TO SEE THS I REMBER IT LIKE IT WAS YESTERDAY BUT IF ANY1 ELSE HAD SEEN IT THY WUD NO TH DAY IT WAS ONLY 1 OF 2 DAYS AND IT WAS WEN I WAS 16 TO 18 YEARS OLD LIKE I SAID CAN ANY 1 PLEASE LET ME KNOW THY SEEN THS COMIT OR METIORITE
I am a metal detectorist, and on my permission (location will be supplied confidentially) I have uncovered what I believe to be a lunar meteorite.
It has a stone like structure with white flecks, it has the pitted surface with one side having significantly less pitting. I have tried the "tile test" and I leaves a streak reminiscent of heavy pencil lead. It is slightly smaller than a ping pong ball and weighs approx 60 grams.
It was unearthed in pyle, bridgend, south wales on 7 june 2020 at approx 11am.
It gives a metallic signal on both of my metal detecting machines, yet it is not magnetic as I've put it on my neodymium magnet and there is no reaction/force at all.
Please do email back asap as I'd like to bring it to you to investigate further.
Many kind regards
Mr S Walker.
Hi Gwynant,
Thank you very much for your enquiry. I've passed it on to one of our Curators, who will be able to advise you further.
Kind regards,
Nia
(Digital Team)
I have done the magnet test its stuck
Weighed the density of the rock
How do i come about getting it checked out ??
Hi Steve,
If you would like me to take a look at it you can always bring it in to National Museum Cardiff. If it is almost impossible to break then it sounds like it could be something manmade, but I would have to see it in person to provide you with an accurate identification.
Kind Regards,
Tom
Senior Curator, Mineralogy
Hi there Steve
Sounds intriguing! I'm going to pass on your message to one of our Curators, who will be able to give you advice on how to identify your rock.
Best wishes
Sara
Digital Team