ធ្វើឱ្យគណនីឥតគិតថ្លៃរបស់អ្នក!
បណ្ណាល័យភាពយន្តនិងវីដេអូរបស់យើងអាចត្រូវបានមើលឬទាញយកដោយសមាជិកតែប៉ុណ្ណោះ
បន្តមើលដោយឥតគិតថ្លៃ➞ចំណាយពេលតិចជាង ១ នាទីដើម្បីចុះឈ្មោះបន្ទាប់មកអ្នកអាចរីករាយនឹងចំណងជើងភាពយន្តនិងទូរទស្សន៍គ្មានដែនកំណត់។
Crash Course Astronomy
How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to find the size of the Earth, and from that the distance to and the sizes of the Moon and Sun. Once the Earth/Sun distance was found, parallax was used to find the distance to nearby stars, and that was bootstrapped using brightness to determine the distances to much farther stars.
ពេលរត់: 12:14 នាទី
គុណភាព: HD
កាលបរិច្ឆេទខ្យល់ដំបូង: Jan 15, 2015
កាលបរិច្ឆេទអាកាសចុងក្រោយ: Dec 24, 2015
ភាគ: 46 ភាគ
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ពាក្យគន្លឹះ : astronomy
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