科学家们推测，在138亿年前宇宙大爆炸早期，氢和氦等较轻的元素，甚至少量的锂都可能存在。后来，一些重元素，包括铁都在星体中形成，但一些比铁重的元素例如金的成因仍是一个谜。

according to the China Manned Space Agency (CMSA). The spaceship is scheduled to return to the Dongfeng landing site in north China's Inner Mongolia Autonomous Region on Wednesday. The CMSA said that ...

[1] Vartolomei L, et al. Bladder Cancer: Depression, anxiety, and suicidality among the highest-risk oncology patients. European Urology Focus. 2020;6(5 ... July 2024. [4] International Agency for ...