One of the best known artifacts of Korea's history of science and technology is Cheomseongdae (첨성대, 瞻星臺), a 9.4-meter high observatory built in 634.
The earliest known surviving Korean example of woodblock printing is the Mugujeonggwang Great Dharani Sutra.[52] It is believed to have been printed in Korea in 750-751 AD which, if correct, would make it older than the Diamond Sutra. Goryeo silk was highly regarded by Westerners and Korean pottery made with blue-green celadon was of the highest quality and sought after by even Arabian merchants. Goryeo had a bustling economy with a capital that was frequented by merchants from all over the known world.
During the Joseon period the Geobukseon (turtle Ship) was invented, which were covered by a wooden deck and iron with thorns,[53][54][55] as well as other weapons such as the bigyeokjincheolloe (비격진천뢰, 飛擊震天雷) and the hwacha.
The Korean alphabet hangul was also invented during this time by King Sejong the Great.
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