ນັກດາລາສາດຄູ່ໜຶ່ງໄດ້ຄົ້ນພົບ “exomoon” ຢູ່ໃນລະບົບສຸລິຍະອື່ນ
ດວງຈັນເປັນວັດຖຸຊັ້ນສູງທີ່ມີຫີນ ຫຼືນ້ຳກ້ອນ ແລະ ມີດວງຈັນທັງໝົດ 200 ດວງຢູ່ໃນລະບົບສຸລິຍະຂອງພວກເຮົາ. ອັນນີ້ລວມເຖິງໂລກ ເດືອນ which is our ຂອງດາວເຄາະ own permanent natural satellite. Moon ວົງໂຄຈອນ the Earth as the ດາວ ແຜ່ນດິນໂລກ ວົງໂຄຈອນ ໄດ້ ດາວ Sun. In our solar system only two ດາວເຄາະ – Mercury and Venus- do not have moons. There are plenty of ດາວເຄາະ beyond our solar system called ‘exoplanets’ which have been confirmed by researchers, though no confirmation is available on moons. For the first time a pair of astronomers Alex Teachey and David Kipping at Columbia University have found strong evidence of a moon in another solar system. Although 3,500 exoplanets are known, this is the first time an exomoon has been discovered. This moon is ວົງໂຄຈອນ ຍັກໃຫຍ່ ດາວ ໃນອີກ ດາວ system which is 8000 light years away from us. Its being called an ‘exomoon’ as it ວົງໂຄຈອນ a ດາວ in another solar system. This celestial object is unique owing to its huge size – diameter being similar to that of ດາວ Neptune or Uranus – and it also looms over a giant Jupiter-sized planet and their pairing has been remarked as a ‘super-size pairing’. The exomoon is nine times bigger than Jupiter’s Ganymede which is the largest moon is our solar system. The Hubble Space telescope and Kepler telescope from The National Aeronautics and Space ການບໍລິຫານ (ອົງການ NASA) have been used to make this significant discovery through investigations into distant ດາວ, planet and a possible moon.
ໃນການສຶກສານີ້ຈັດພີມມາຢູ່ໃນ Science Advances what is being hailed as a milestone in astronomy, Teachey and Kipping examined data from 284 exoplanets which have been discovered till date by Kepler telescope which were seen in wide orbits for more than one month around their ດາວ. The observations were able to measure brief dimming of a star’s light when the planet passed in front of the star i.e. during the transit. ດາວເຄາະນອກດວງດາວ are discovered by astronomers by observing this reduction in brightness of the star which the planet orbits. This method is called the ‘transit method’. Theoretical models of planet formation are unable to make such predictions and that is why the transit method is used. This planet (or exoplanet), called Kepler 1625b was the only planet around the particular star. When analysing observations, researchers found one particular instance with interesting features and anomalies. This star is about the 70 percent larger than our Sun but is older and the planet is at the same distance from its star as Earth is to the Sun. Although the object was not visible but many evidences hinted towards its existence. Particularly, small deviations and wobbles were seen in the light curve. This was an interesting result based upon which researchers intensively studied the planet for around 40 hours using the Hubble telescope. Before and during the 19-hour transit of the planet across the star observations were recorded. The planet is thought to be revolving around its star in such way that it looks like a possible moon is pulling onto it gravitationally. When the planet moved in front of the star, the star’s light was dimmed very much hinting that there was something else present too. This dimness in stellar brightness was similar to the movement of the moon around the planet as only a moon could cause this kind of uncertain and wobbly path and this made for a strong evidence.
ການສັງເກດການທີ່ຄ້າຍຄືກັນ ແລະຄວາມຜິດກະຕິໃນກຳນົດເວລາຈະເຫັນໄດ້ຖ້າມີຄົນຈາກນອກລະບົບສຸລິຍະຂອງພວກເຮົາ (ນອກລະບົບສຸລິຍະ) ກໍາລັງເບິ່ງດວງຈັນຜ່ານດາວເຄາະໂລກຂອງພວກເຮົາ. exomoon ນີ້ຈະຢູ່ຫ່າງຈາກດາວຂອງມັນປະມານ 2 ລ້ານໄມ (3 ລ້ານກິໂລແມັດ) ແລະທີ່ຈິງແລ້ວຈະມີຂະຫນາດໃຫຍ່ກວ່າສອງເທົ່າຂອງດວງຈັນຂອງພວກເຮົາຈະປະກົດຢູ່ເທິງໂລກ. ນັກຄົ້ນຄວ້າວາງແຜນທີ່ຈະສັງເກດດາວອີກເທື່ອຫນຶ່ງບາງຄັ້ງໃນອະນາຄົດເພື່ອເຮັດໃຫ້ການກວດສອບເພີ່ມເຕີມ, ອາດຈະເປັນໃນປີ 2019. ສິ່ງທີ່ເຂົາເຈົ້າໄດ້ສັງເກດເຫັນໃນຄວາມພະຍາຍາມຄັ້ງທໍາອິດຂອງພວກເຂົາແນ່ນອນຊີ້ໃຫ້ເຫັນເຖິງການຕັດສິນນີ້ແລະຄວາມເປັນໄປໄດ້ອື່ນໆໄດ້ຖືກປະຕິເສດ. ນອກຈາກນີ້, ຂະໜາດໃຫຍ່ຂອງ exomoon ແລະດາວເຄາະຂອງມັນໄດ້ຊ່ວຍໃຫ້ນັກຄົ້ນຄວ້າໄດ້ຍ້ອນວ່າສິ່ງທີ່ໃຫຍ່ກວ່າແມ່ນງ່າຍຕໍ່ການກວດພົບ. ນອກຈາກນັ້ນ, ເນື່ອງຈາກວ່າວົງເດືອນກໍາລັງໂຄຈອນຂອງດາວເຄາະ, ຕໍາແຫນ່ງຂອງມັນສືບຕໍ່ເຄື່ອນຍ້າຍກັບການຂົນສົ່ງ. ນີ້ເປັນຜົນສໍາເລັດທີ່ດີທີ່ສຸດເນື່ອງຈາກວ່າດວງຈັນແມ່ນຍາກທີ່ຈະຊອກຫາໄດ້ເນື່ອງຈາກຂະຫນາດຂອງມັນເມື່ອທຽບໃສ່ກັບດາວພະຍາດ, ສະນັ້ນພວກເຂົາເຈົ້າສະແດງໃຫ້ເຫັນສັນຍານການຂົນສົ່ງທີ່ອ່ອນແອ. ດາວເຄາະ ແລະດວງຈັນແມ່ນທັງສອງໜ່ວຍທາດອາຍແກັສ ດັ່ງນັ້ນ ນັກຄົ້ນຄວ້າຈະບໍ່ຊອກຫາສັນຍານຂອງຊີວິດ. ເຖິງແມ່ນວ່າທັງສອງຫນ່ວຍເຫຼົ່ານີ້ຢູ່ໃນພື້ນທີ່ທີ່ຢູ່ອາໄສຂອງດາວເຈົ້າພາບບ່ອນທີ່ນ້ໍາຂອງແຫຼວຫຼືຂອງແຂງອື່ນໆອາດຈະເປັນຍ້ອນອຸນຫະພູມປານກາງ.
ນີ້ແມ່ນຄັ້ງທໍາອິດທີ່ exomoon ໄດ້ຖືກຄົ້ນພົບ. ການສຶກສານີ້ເຮັດໃຫ້ການຮຽກຮ້ອງພິເສດແລະນັກດາລາສາດຫຼາຍຄົນເຊື່ອວ່າຂໍ້ມູນທັງຫມົດນີ້ຕ້ອງໄດ້ຮັບການເຂົ້າໃຈດ້ວຍຄວາມກັງວົນບາງຢ່າງແລະແນ່ນອນວ່າຕ້ອງການຫຼັກຖານແລະການສືບສວນຕື່ມອີກ. ການສຶກສານີ້ຫາກໄດ້ດຳເນີນການຕໍ່ໄປຢ່າງສຳເລັດຜົນ ສາມາດເຮັດໃຫ້ພວກເຮົາມີຄວາມເຂົ້າໃຈຫຼາຍຂຶ້ນກ່ຽວກັບວິທີການເກີດຂອງດວງຈັນ ແລະ ພວກມັນສ້າງມາຈາກອັນໃດ ແລະລະບົບດາວເຄາະມີການພັດທະນາແນວໃດ ແລະລະບົບສຸລິຍະທີ່ເກີດຈາກສິ່ງອື່ນໆ.
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{ທ່ານສາມາດອ່ານເອກະສານການຄົ້ນຄວ້າຕົ້ນສະບັບໄດ້ໂດຍການຄລິກທີ່ລິ້ງ DOI ທີ່ໃຫ້ໄວ້ຂ້າງລຸ່ມນີ້ໃນລາຍຊື່ແຫຼ່ງທີ່ອ້າງອີງ}
ແຫຼ່ງຂໍ້ມູນ (s)
Teachey A ແລະ Kipping DM 2018. ຫຼັກຖານສໍາລັບ exomoon ໃຫຍ່ທີ່ວົງໂຄຈອນ Kepler-1625b. ວິທະຍາສາດກ້າວໜ້າ 03 Oct 2018: Vol. 4, ບໍ່. 10, DOI:https://doi.org/10.1126/sciadv.aav1784
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