The Large Magellanic Clouds

Paper I: The Large Magellanic Cloud introduces the Large Magellanic Cloud (LMC), a large and distracting galaxy that is almost invisible to the naked eye between Mensa and Dorado. The same names were named after Ferdinand Magellan, he realized their existence on a world trip 1,3 This pair of galaxies shares a dust belt and interacts through a tidal force. The form of LMC can be expressed as "an irregular swirl galaxy with three spiral arms and an elongated outer ring".

Several galaxies outside the Milky Way such as Andromeda galaxy, Large Magellanic clouds, Small Magellanic clouds, etc. can be seen with the naked eye in the dark night. In the 10th century, Persian astronomer Al Sufi first recorded the identification of the Andromeda galaxy and expressed it as a "small cloud". In 964, Al · Sufi lived in the latitude of about 70 ° of his Antarctica, so he may have mentioned the Large Magellanic Cloud at his fixed stars (called "South Arabian Al Bakr") . Clearly, talent from Europe knew this until the voyage of Magellan in the 16th century. The Andromeda galaxy was later noticed by Simon Marius in 1612. In 1734, the philosopher Emmanuel Swedenborg assumed in his principalia that the galaxies outside ourselves could form clusters of galaxies. Can see

Pickering assigned Leavitt to study small and large Magellanic cloud variable stars, which are recorded in the picture taken by Bruce Astrograph at Boyden station in Al Khafah Observatory in Peru. She identified 1777 variable stars. In 1908, she announced her research in the Harvard University Observatory annual report, pointed out that brighter variables have longer time. In another paper published in 1912, Levit carefully examined the relationship between the period and brightness of 25 cephemoid variate samples of the Small Magellanic Cloud. This article was conveyed and signed by Edward Pickering, but the first sentence indicated that its content was "prepared by Miss Leavitt". Levit said in his own words,