태양은 뜨거운데 왜 우주는 얼어붙을 만큼 차가울까?

The universe is cold — the universe is cold, yet the sun burns at 27 million degrees Fahrenheit. This strange paradox that the universe is cold quietly reveals the true meaning of heat, radiation, vacuum, and temperature. This video slowly explains why space is so cold, approaching near absolute zero, despite the sun emitting tremendous energy. It calmly follows what temperature means, how heat travels, and why only radiation can transmit energy in a vacuum. It also examines the process by which sunlight travels through 150 million kilometers of empty space to warm the Earth, the extreme temperature differences astronauts experience between light and shadow, and how spacecraft withstand heat and cold. It is okay if you don't watch it intently. Just play it quietly and slowly feel the strange relationship between the sun and the universe, and between heat and light. #TheUniverseIsCold #SpaceDocumentary #SunAndUniverse #ScienceForSleep #Astronomy