{"id":25919,"date":"2026-04-28T09:59:52","date_gmt":"2026-04-28T08:59:52","guid":{"rendered":"https:\/\/www.petrhoralek.com\/?p=25919"},"modified":"2026-04-28T10:16:05","modified_gmt":"2026-04-28T09:16:05","slug":"six-hours-of-large-magellanic-cloud","status":"publish","type":"post","link":"https:\/\/www.petrhoralek.com\/?p=25919","title":{"rendered":"Six hours of Large Magellanic Cloud"},"content":{"rendered":"
\"Six<\/a>

Six hours of Large Magellanic Cloud<\/p><\/div>\n

The last night of my current stay at Cerro Pach\u00f3n Observatory on (4-5 May 2025), where astronomers at Vera C. Rubin Telescope<\/a> just started their amazing work<\/a>, I tried to finish my longer-term photography project. The Large Magellanic Cloud (LMC) photography, which I actually started days sooner in Bolivia<\/a>.<\/p>\n

As NOIRLab says<\/a>: The LMC is one of the 60+\u00a0satellite galaxies<\/a>\u00a0orbiting the\u00a0Milky Way<\/a>. Satellite galaxies are usually smaller than their host galaxy. Case in point, the LMC consists of around 20 billion stars, while our Milky Way galaxy holds between 100\u2013400 billion stars. The LMC is also considered an\u00a0irregular galaxy<\/a>\u00a0because of its indistinct shape. Its central bright bar is geometrically off-center, which has led astronomers to believe this galaxy was once a\u00a0barred spiral galaxy<\/a>, like the Milky Way. The LMC\u2019s once well-defined spiral arms have been warped by the pull of gravity, likely from the Milky Way and the Small Magellanic Cloud (SMC<\/a>), another dwarf galaxy visible near the LMC.<\/p>\n

The Small Magellanic Cloud (SMC) is a dwarf irregular galaxy located about **200,000 light-years** from Earth, making it one of the closest galactic neighbors of the Milky Way. It spans roughly **7,000 light-years** across and contains several hundred million stars\u2014far fewer than the Milky Way\u2019s hundreds of billions. One of its most interesting physical features is its **distorted, irregular shape**, which is the result of strong gravitational interactions with both the Milky Way and its companion, the Large Magellanic Cloud. These interactions have triggered bursts of star formation, making the SMC rich in young, hot stars and glowing nebulae. It also has a relatively low metallicity** (few heavy elements), which gives astronomers insight into conditions similar to those in the early universe.<\/p>\n

Around the Small Magellanic Cloud, astronomers observe a number of **globular clusters** and stellar associations, though it has fewer than larger galaxies. Notable clusters include NGC 121, one of the oldest known clusters in the SMC, and 47 Tucanae, which, although actually part of the Milky Way, appears close to the SMC in the sky. The region is also surrounded by the **Magellanic Bridge**, a stream of gas and stars connecting it to the Large Magellanic Cloud, and the **Magellanic Stream**, a long tail of gas trailing behind both galaxies. These structures provide clear evidence of ongoing gravitational interaction and material exchange, making the SMC a key object for studying how galaxies evolve through interaction.<\/p>\n

Like most irregular galaxies, the LMC is a prime site for star formation. It even hosts the most active star-forming region among our\u00a0nearby galaxies<\/a>, the nebula\u00a0Doradus 30<\/a>\u00a0(Tarantula Nebula). The LMC also has an extra advantage: the more massive LMC has been observed to\u00a0\u201csteal\u201d gas and stars<\/a>\u00a0from the neighboring SMC. As the stellar materials are pulled from the SMC, they collide with the LMC\u2019s own materials and form an intergalactic gaseous bridge between the clouds. These collisions pressurize and concentrate the gas, making star formation much more likely in the LMC and the bridge itself. Used Canon Ra, Tamron 70-200mm@200mm, f2.8, ISO 3200, 30s exposures, 6.2 hours total integration time.<\/p>\n

Full credit: NOIRLab\/NSF\/AURA\/P. Hor\u00e1lek (Institute of Physics in Opava).
\nSee also Four hours of Small Magellanic Cloud<\/a>.<\/p>\n

\u010cesk\u00e9 zamy\u0161len\u00ed:<\/p>\n

Ticho. Naprost\u00fd klid. Samota. Po tom druh\u00e9m zem\u011bt\u0159esen\u00ed u\u017e tomu ani nev\u011b\u0159\u00edm, ale pro\u010d to nezkusit. Je to p\u0159eci jen \u00fapln\u011b posledn\u00ed noc. Z\u00edtra u\u017e val\u00edm dop\u0159edu sjednanou dopravou dol\u016f k oce\u00e1nu do La Sereny, poz\u00edt\u0159\u00ed r\u00e1no moji hutnou bag\u00e1\u017e nahod\u00ed na palubu Airbusu a aloha. Tak to zkou\u0161\u00edm znovu, naposledy. Stoj\u00ed v z\u00e1v\u011bt\u0159\u00ed ob\u0159\u00ed kopule ji\u017en\u00edho Bl\u00ed\u017eence, ehm, teleskopu Gemini South v nadmo\u0159sk\u00e9 v\u00fd\u0161ce asi 2737 metr\u016f nad mo\u0159em. Vr\u0161ky masivn\u00ed konstrukce zp\u00edvaj\u00ed samy pro sebe v tom v\u011btru. Co jen asi? \u00d3du? Svou hymnu? Mo\u017en\u00e1 je to jedno, beztak n\u011bkdo v \u0159\u00edd\u00edc\u00edm centru zanedlouho zavel\u00ed a kopuli pooto\u010d\u00ed \u00fapln\u011b jin\u00fdm sm\u011brem. A p\u00edse\u0148 se zm\u011bn\u00ed.<\/p>\n

Nech\u00e1v\u00e1m t\u011b\u017ek\u00fd objektiv na k\u0159ehk\u00e9 mont\u00e1\u017ei ladem. Mont\u00e1\u017e nas\u00e1v\u00e1 \u0161\u0165\u00e1vu z powerbanky, powerbanka zase vis\u00ed v m\u011bkk\u00e9m vaku zav\u011b\u0161en\u00e9m na nejrobustn\u011bj\u0161\u00edm stativu, co m\u00e1m. Lep\u0161\u00ed u\u017e to nebude. Bude to ale sta\u010dit? N\u011bjak\u00e1 data jsem po\u0159\u00eddil p\u0159ed n\u011bkolika dny v t\u00e9m\u011b\u0159 5000 metrech nad mo\u0159em v Bol\u00edvii. Ale p\u0159eci jenom je\u0161t\u011b aspo\u0148 hodina dal\u0161\u00edch dat by neskute\u010dn\u011b pomohla. Na tenhle kosmick\u00fd objekt si brous\u00edm nehty u\u017e l\u00e9ta, ale nikdy nebyl \u010das. A tuhle noc ho taky moc nen\u00ed, M\u011bs\u00edc sv\u00fdm svitem z n\u00ed ukradl nem\u00e1lo a l\u00edbezn\u00fd objekt po zbytku noci bude u\u017e jen a jen klesat n\u00ed\u017e k obzoru. Za humny. Za hustou jasnou z\u00e1clonu z\u00e1\u0159\u00edc\u00edho vzduchu, p\u0159es kterou jeho obraz bude opravdu \u0161patn\u011b \u010diteln\u00fd, \u0161patn\u011b zpracovateln\u00fd.<\/p>\n

Jak to dopadlo, vid\u00edte sami. Na posledn\u00ed chv\u00edli dob\u0159e. Dokupy celkem v\u00edce jak 6 \u00fasp\u011b\u0161n\u00fdch hodin sn\u00edm\u00e1n\u00ed, z toho zhruba \u010dty\u0159i na observato\u0159i Cerro Pach\u00f3n, kde jen p\u00e1r des\u00edtek metr\u016f za m\u00fdmi z\u00e1dy zrovna spustili veleo\u010dek\u00e1van\u00fd teleskop Very C. Rubinov\u00e9, odhalily nev\u00eddan\u00e9. A co vlastn\u011b vid\u00edte? Jedn\u00e1 se o j\u00e1dro a okol\u00ed kr\u00e1sn\u00e9 a pro cestovatele do ji\u017en\u00edch \u0161\u00ed\u0159ek zn\u00e1m\u00e9 o\u010dima viditeln\u00e9 galaxie, pojmenovan\u00e9 na po\u010dest legend\u00e1rn\u00edho mo\u0159eplavce Velk\u00e9 Magellanovo mra\u010dno. Ta se ve vzd\u00e1lenosti asi 163 tis\u00edc sv\u011bteln\u00fdch let p\u00fd\u0159\u00ed i p\u0159ed voln\u00edmi lidsk\u00fdmi zraky pobl\u00ed\u017e ji\u017en\u00edho nebesk\u00e9ho p\u00f3lu jako v\u016fbec nejbli\u017e\u0161\u00ed galaxie, na kter\u00e9 m\u016f\u017ee lidsk\u00e9 oko spo\u010dinout.\u00a8<\/p>\n

Jak jsem tam tak st\u00e1l a koukal na n\u00ed, p\u0159em\u00edtal jsem v hlav\u011b. Jen des\u00edtky tis\u00edc\u016f sv\u011bteln\u00fdch rok\u016f daleko od n\u00e1s le\u017e\u00ed tenhle hv\u011bzdn\u00fd ostrov \u010d\u00edtaj\u00edc\u00ed a\u017e 20 miliard vlastn\u00edch, mnohdy mlad\u00fdch hv\u011bzd a spoustu materi\u00e1l\u016f na stavby nov\u00fdch sv\u011bt\u016f. Jen v n\u011bco p\u0159es 160 tis\u00edc sv\u011bteln\u00fdch let vzd\u00e1len\u00e9m vesm\u00edrn\u00e9m sousedstv\u00ed m\u016f\u017ee b\u00fdt tak\u00e9 sv\u011bt kyp\u00edc\u00ed \u017eivotem. A ne jeden. Snad je tam sv\u011bt pln\u00fd pochopen\u00ed a n\u011b\u010deho, \u010demu v na\u0161em jazyce \u0159\u00edk\u00e1me tolerance, lidskost, empatie a pochopen\u00ed. Snad je tam sv\u011bt, kde je spravedlnost na stran\u011b dobr\u00fdch, z\u00e1sadov\u00fdch a spravedliv\u00fdch lid\u00ed a ne masov\u00fdch vrah\u016f a vy\u0161inut\u00fdch bl\u00e1zn\u016f u moci. Snad je tam i sv\u011bt, jeho\u017e obyvatel\u016fm z\u00e1le\u017e\u00ed na ostatn\u00edch, budoucnosti sv\u00e9ho pokolen\u00ed i jin\u00fdch druh\u016f a na sv\u00e9 vlastn\u00ed planet\u011b. Snad je i tam takov\u00fd sv\u011bt, ve kter\u00e9m se tamn\u00ed obyvatel\u00e9 nestyd\u00ed za v\u00fdvoj vlastn\u00ed rasy. A mnoh\u00e9 dal\u0161\u00ed snad.<\/p>\n

C\u00edtil jsem se p\u0159itom tak mal\u00fd, v\u011bdom si toho, \u017ee na tom na\u0161em sv\u011bt\u011b takov\u00e9 hodnoty miz\u00ed a \u017ee s t\u00edm jako ani ne dvoumetrov\u00fd tvor na t\u00e9m\u011b\u0159 13 tis\u00edc kilometr\u016f velk\u00e9m sv\u011bt\u011b v oblasti zvan\u00e9 Slune\u010dn\u00ed soustava nic nenad\u011bl\u00e1m. Pustil jsem si tedy ve sluch\u00e1tk\u00e1ch podmanivou hudbu do toho ticha, naprost\u00e9ho klidu a samoty, a po tom druh\u00e9m zem\u011bt\u0159esen\u00ed se pod tou p\u0159ekr\u00e1snou hv\u011bzdnou pe\u0159inou v legend\u00e1rn\u00ed chilsk\u00e9 pou\u0161ti Atacama vno\u0159il do dal\u0161\u00edho sn\u011bn\u00ed. Proto\u017ee to jedin\u00e9 mi na tomhle sv\u011bt\u011b, p\u0159es 160 tis\u00edc sv\u011bteln\u00fdch let vzd\u00e1len\u00e9m od t\u00e9 l\u00edbezn\u00e9 galaxie na obzoru nikdo nem\u016f\u017ee sebrat. Zvl\u00e1\u0161t\u011b tady v t\u00e9 pou\u0161ti vedle ob\u0159\u00edch stroj\u016f, kter\u00e9 sna\u017e\u00ed lidstvu uk\u00e1zat jejich m\u00edsto i neomezen\u00e9 a do budoucna \u00fa\u017easn\u00e9 mo\u017enosti v tom ob\u0159\u00edm neprob\u00e1dan\u00e9m vesm\u00edru…<\/p>\n","protected":false},"excerpt":{"rendered":"

The last night of my current stay at Cerro Pach\u00f3n Observatory on (4-5 May 2025), where astronomers at Vera C. Rubin Telescope just started their amazing work, I tried to finish my longer-term photography project. The Large Magellanic Cloud (LMC) photography, which I actually started days sooner in Bolivia. As NOIRLab says: The LMC is…
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