2019年度的诺贝尔物理学奖授予了三位天文学家，以表彰他们使我们理解宇宙的演化和地球在宇宙中的位置方面的贡献。其中，美国普林斯顿大学的宇宙学家皮布尔斯(P. J. E. Peebles)获得一半奖金，以奖励他在物理宇宙学中的理论发现；瑞士日内瓦大学的马约尔(Michel Mayor)和瑞士日内瓦大学及英国剑桥大学的奎洛兹(Didier Queloz)分享了另一半奖金，以奖励他们发现一颗环绕类似太阳的恒星的行星。文章介绍这几位学者的科学贡献。

The Nobel Physics Prize is awarded to three astronomers for their contributions on helping us to understand the cosmic evolution and the Earth in the Universe. P. J. E. Peebles from the Princeton University, USA, are given half of the prize, for his theoretical works in physical cosmology. Michel Mayor of the Geneva University, Switzerland, and Didier Queloz of the Cambridge University shared the other half of the prize, for their first discovery of a planet circling sun-like star. We give a popular introduction to their works.