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Űrnapló: Az új felvételeken kínai űrhajósok ebédelnek a zűrállomáson
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Törölt tag
Guest
ozt mit mondanak?Hát azért Spacexnél sincs kolbászból a kerítés:
No toilet for returning SpaceX crew, stuck using diapers
The astronauts who will depart the International Space Station on Sunday will be stuck using diapers on the way home.apnews.com
teli volt a gatya?
Szerinted? Majd 24 órát kellett az űrkapszulában tölteniük.ozt mit mondanak?
teli volt a gatya?
T
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Guest
T
Törölt tag
Guest
Csendes megjegyzés: minden űrruha alá vesznek pelenkát Shepard óta mert azt leveni nem 2 perc. Momentán nem ismerem, milyen egyszerű egy nem űrséta-szakafandert levenni űrítéshez de kb. ugyanannyi lehet egy pelenkacsere is vagy egy zacskóba vizelés.
Csúszik az Artemis-program, legkorábban 2025-ben szállhatnak Holdra az amerikai űrhajósok
Elon Musk és Jeff Bezos jogi vitája is hátráltatta a programot. Minimum egy nő és egy színes bőrű űrhajós is részt vesz a küldetésben.
telex.hu
Ez a cikk érdekes lehet, de bonyolult a hozzáférése.
Star System With Right-Angled Planets Surprises Astronomers (Published 2021)
Two planets orbit the poles while another revolves around the star’s equator, suggesting a mysterious, undetected force.www.nytimes.com
K
kamm
Guest
Ez a cikk érdekes lehet, de bonyolult a hozzáférése.
Star System With Right-Angled Planets Surprises Astronomers
Two planets orbit the poles while another revolves around the star’s equator, suggesting a mysterious, undetected force
By Jonathan O’Callaghan
Nov. 6, 2021
Star systems come in all shapes and sizes. Some have lots of planets, some have larger planets and others have no planets at all. But a particularly unusual system about 150 light-years from our own has scientists scratching their heads.
In 2016, astronomers discovered two planets orbiting the star HD 3167. They were thought to be super-Earths — between Earth and Neptune in size — and circled the star every one and 30 days. A third planet was found in the system in 2017, orbiting in about eight days.
What’s unusual is the inclinations of the outer two planets, HD 3167 c and d. Whereas in our solar system all the planets orbit in the same flat plane around the sun, these two are in polar orbits. That is, they go above and below their star’s poles, rather than around the equator as Earth and the other planets in our system do.
Now scientists have discovered the system is even weirder than they thought. Researchers measured the orbit of the innermost planet, HD 3167 b, for the first time — and it doesn’t match the other two. It instead orbits in the star’s flat plane, like planets in our solar system, and perpendicular to HD 3167 c and d. This star system is the first one known to act like this.
“It was clearly a surprise,” said Vincent Bourrier, from the University of Geneva in Switzerland, who led the discovery published last month in the journal Astronomy & Astrophysics. “This is something radically different from our own solar system.”
K
kamm
Guest
While none of the planets are thought to be habitable, were you to stand on one you would see a rather intriguing view of this peculiar system. “If you had a telescope and you were looking at the trajectory of the other planets in the system, they would be going vertically in the sky,” Dr. Bourrier said.
Finding exoplanets in polar orbits is not wholly unusual, said Andrew Vanderburg of the Massachusetts Institute of Technology, who led the initial discovery of HD 3167 c and d but was not involved in the new research. But the perpendicular nature of this system “is odd,” he said.
The latest discovery was made possible by an instrument on the Very Large Telescope in Chile, called ESPRESSO. Using extremely precise measurements of the star, the scientists were able to track the direction in which the innermost planet was passing in front of its star relative to us, known as a transit, and work out the angle of its orbit.
The misalignment in the system may result from an unseen object in its outer reaches. Shweta Dalal, from the University of Exeter in England, has studied the system and said there was evidence of a Jupiter-size planet orbiting the star every 80 days. The gravitational effect of this world could have pushed the outer two planets into their unusual orbits, while the innermost planet remained locked to the star owing to its tight orbit.
“A Jupiter-sized planet could be massive enough to tilt the planets,” Dr. Dalal said.
While our solar system has its own massive Jupiter, the wider orbits of our planets means the same fate has not befallen Earth or the other planets. In contrast, the planets that orbit HD 3167 “are all within the orbit of Mercury,” Dr. Dalal said, and thus close together, magnifying the effects of their interactions.
Upcoming observations may reveal more systems like this. The European Space Agency’s Gaia telescope, which is mapping billions of stars in the Milky Way, is expected to reveal data soon on thousands of giant planets in other star systems, including inclination data for those that transit. Dr. Bourrier and his team also hope to use ESPRESSO to make similar observations of other systems.
The unusual configuration of HD 3167 highlights just how weird and wonderful other stars and their planets can be. “It puts in perspective again what we think we know about the formation of planetary systems,” Dr. Bourrier said. “Planets can evolve in really, really different ways.”
Finding exoplanets in polar orbits is not wholly unusual, said Andrew Vanderburg of the Massachusetts Institute of Technology, who led the initial discovery of HD 3167 c and d but was not involved in the new research. But the perpendicular nature of this system “is odd,” he said.
The latest discovery was made possible by an instrument on the Very Large Telescope in Chile, called ESPRESSO. Using extremely precise measurements of the star, the scientists were able to track the direction in which the innermost planet was passing in front of its star relative to us, known as a transit, and work out the angle of its orbit.
The misalignment in the system may result from an unseen object in its outer reaches. Shweta Dalal, from the University of Exeter in England, has studied the system and said there was evidence of a Jupiter-size planet orbiting the star every 80 days. The gravitational effect of this world could have pushed the outer two planets into their unusual orbits, while the innermost planet remained locked to the star owing to its tight orbit.
“A Jupiter-sized planet could be massive enough to tilt the planets,” Dr. Dalal said.
While our solar system has its own massive Jupiter, the wider orbits of our planets means the same fate has not befallen Earth or the other planets. In contrast, the planets that orbit HD 3167 “are all within the orbit of Mercury,” Dr. Dalal said, and thus close together, magnifying the effects of their interactions.
Upcoming observations may reveal more systems like this. The European Space Agency’s Gaia telescope, which is mapping billions of stars in the Milky Way, is expected to reveal data soon on thousands of giant planets in other star systems, including inclination data for those that transit. Dr. Bourrier and his team also hope to use ESPRESSO to make similar observations of other systems.
The unusual configuration of HD 3167 highlights just how weird and wonderful other stars and their planets can be. “It puts in perspective again what we think we know about the formation of planetary systems,” Dr. Bourrier said. “Planets can evolve in really, really different ways.”
Állítólag hamarosan 400 fontnyi hasznos terhet próbálnak pályára állítani.
A Pentagon pedig aktívan támogatja ezeket az alternatív eljárásokat, amikkel gyorsan lehetne kisméretű műholdakat alacsony pályára szórni.
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molnibalage
Guest
Az ASM-135-höz próbálom mérni, hogy annak milyen tömege volt és azt kb. 12 km magasan engedték el szuperszonikus sebesség táján.
És az többfokozatú cucc volt. A hasznos teher meg 10 kg nagyságrend, ha volt.
Hát igen. Mondjuk, a célja a két eszköznek azért teljesen más. Nem értek hozzá, de lehet, hogy közvetlen műholdelfogáshoz, 500 km körüli pályáig azért komolyabb kraft (és tartalék a manőverezéshez) kell, mint ahhoz, hogy pár begyújtással úgy-ahogy a LEO aljára rugdossanak valamit.
Én is szkeptikus vagyok.
M
molnibalage
Guest
A legnagyobb problémája ennek az izének, hogy iszonyatosan kis tömegű cuccot küld fel.
Az, hogy mennyire irányítható az indítás nem tudom, de gondolom felpörgetés előtt valamennyire talán irányba állítható a szerkezet, hogy a pályák ne legyenek kötöttek.
De én nagyon szkeptikus vagyok. Itt most M1 sebességet értek el.
Hogy az egésznek értelme legyen alsó hangon M10 táján kéne elengedni. Vákumos területből légkörbe M10-zel lépni az álomskönyv szerint nem jó.
Egész egyszerűen pont az igényekkel ellentétes, hogy 0 méteren legyen nagy kezdősebesség.
Lehet, hogy túl maradni vagyok, de ekkora tömegű teher esetén ezt én végtelenül túlbonyolítottnak tartom.
Az 48N6 rakéta család 10 km magasan összehozza 200 kg hasznos teherrel a 1800 m/s égésvégi sebességet.
Kb. egy ekkora nagyságrendű első fokozattal fel lehet tolni ekkora tömeget.
Ehhez képest ez a gép drága és nehezen mozgatható.
Viszont egy ilyen első fokozatot röhögve felvisz 10 km magasra még egy F-15 méretű gép CL függesztésen, ahova 5000 font mehet.
10 km magasan indítva egy ilyen rakétát röhögve elmegy M8.0 tájára is.
Nem igazán értem az erőlködést ezzel.
Köszi, hogy bemásoltad a cikket!While none of the planets are thought to be habitable, were you to stand on one you would see a rather intriguing view of this peculiar system. “If you had a telescope and you were looking at the trajectory of the other planets in the system, they would be going vertically in the sky,” Dr. Bourrier said.
Finding exoplanets in polar orbits is not wholly unusual, said Andrew Vanderburg of the Massachusetts Institute of Technology, who led the initial discovery of HD 3167 c and d but was not involved in the new research. But the perpendicular nature of this system “is odd,” he said.
The latest discovery was made possible by an instrument on the Very Large Telescope in Chile, called ESPRESSO. Using extremely precise measurements of the star, the scientists were able to track the direction in which the innermost planet was passing in front of its star relative to us, known as a transit, and work out the angle of its orbit.
The misalignment in the system may result from an unseen object in its outer reaches. Shweta Dalal, from the University of Exeter in England, has studied the system and said there was evidence of a Jupiter-size planet orbiting the star every 80 days. The gravitational effect of this world could have pushed the outer two planets into their unusual orbits, while the innermost planet remained locked to the star owing to its tight orbit.
“A Jupiter-sized planet could be massive enough to tilt the planets,” Dr. Dalal said.
While our solar system has its own massive Jupiter, the wider orbits of our planets means the same fate has not befallen Earth or the other planets. In contrast, the planets that orbit HD 3167 “are all within the orbit of Mercury,” Dr. Dalal said, and thus close together, magnifying the effects of their interactions.
Upcoming observations may reveal more systems like this. The European Space Agency’s Gaia telescope, which is mapping billions of stars in the Milky Way, is expected to reveal data soon on thousands of giant planets in other star systems, including inclination data for those that transit. Dr. Bourrier and his team also hope to use ESPRESSO to make similar observations of other systems.
The unusual configuration of HD 3167 highlights just how weird and wonderful other stars and their planets can be. “It puts in perspective again what we think we know about the formation of planetary systems,” Dr. Bourrier said. “Planets can evolve in really, really different ways.”
Nagyon érdekes világ lehet. Írja a szerző, hogy egy "láthatatlan" objektum okozhatja a bolygópályák eltérőségét. Ez biztos olyan halvány, hogy jelenleg nem tudjuk észlelni. Nevezhetnénk kettős csillag rendszernek, mivel a csillagcsíránál nem indult be a fúziós folyamat, mivel nem elég nagy tömegű. Nyilván távolabb lehet a főcsillagtól. Ismerünk hasonlót a Centaurus rendszerben, a Proxima jó messze van az "A" és "B" tagtól.
De lehet kozmikus katasztrófa nyoma is, esetleg egy másik csillag pályája keresztezte ezekét.
A Naprendszerünkkel kapcsolatban is időnként fellángolnak olyan elméletek, hogy a Napnak is van távol egy sötét nagy tömegű párja, ahol nem indult be az energia termelési folyamat. A Plútó rendszerének pályaadatai ezt sugalják.
Még annyit, hogy a exo bolygók felfedezése úgy történik alapvetően, hogy az keringési síkja gyakorlatilag megegyezik a Föld helyzetével, így mikor a bolygó elhalad a napja előtt, az betakar és fénycsökkenésként érzékelik műszereink. Számtalan pályasík lehet, így számtalan bolygót nem tudunk kimutatni. A mi Naprendszerünk fő síkja is eltér a Tejútrendszer síkjától.
Biztos jó zagyvára sikeredett a bejegyzésem, mert nincs sok időm. most. Előre is bocsika.
T
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Guest
Én anno olyat láttam, hogy az élettel rendelkező bolygóhoz szükség van egy Jupiter szerű meteor csapdára, ami megóvja a belső kisebb bolygókat a meteorok nagyjától azzal, hogy magához vonzza őket. Ezt vizsgálják első körben, mivel egy akkora bolygó már periodikus kilengéseket okoz a csillagánál.