科学家们使用最先进的宇宙飞船和地面望远镜来观察以前从未见过的太阳，并向我们重现了太阳核心的情况。从中心到0.25太阳半径是太阳发射巨大能量的真正源头，也称为核反应区。在这里，太阳核心处温度高达1500万度，压力相当于3000亿个大气压，随时都在进行着四个氢核聚变成一个氦核的热核反应。 爱奇艺视频
解说：Lance Lewman
联合制作：Duncan Copp LTD, National Geographic, NOVA/WGBH Boston
What is it like to be a dog, a shark or a bird This question is now getting serious attention from scientists who study animal senses. Humans rely on smell, sight, taste, touch and sound; other animals have super-powered versions of these senses, and a few have extra senses we don't have at all. From a dog that seems to use smell to tell time to a dolphin that can "see" with i...
