タグ　：　宇宙物理学

As Douglas Adams wrote in The Hitchhiker’s Guide to the Galaxy, “Space is big.... You just won’t believe how vastly, hugely, mind-bogglingly big it is.” We and many other astronomers … 続きを読む →

Gravitational waves—ripples in spacetime produced by merging black holes, colliding neutron stars, detonating supernovae and other cosmic cataclysms—have sparked a revolution in astrophysics. Firs … 続きを読む →

When a star the size of 20 suns dies, it becomes, in the words of astrophysicist Zaven Arzoumanian, “the most outrageous object that most people have never heard of”—a city-size body of improbab … 続きを読む →

The stars still have secrets. We know why they shine, and we know why they twinkle, but we still do not know why they move the way they move. The problem has been with us for the better part of a cent … 続きを読む →

Imagine the universe in its infancy. Most scientists think space and time originated with the big bang. From that hot and dense start the cosmos expanded and cooled, but it took a while for stars and … 続きを読む →

The cosmos is mostly made of something we cannot see. That was the conclusion astronomers started to reach in the 1930s through looking at galaxy clusters, which should have blown apart unless some … 続きを読む →

One quiet afternoon in the fall of 2014, just as the trees were changing from green to gold, Tabetha Boyajian visited our astronomy department at Pennsylvania State University to share an unusual disc … 続きを読む →

I love to be outdoors during solar eclipses, enjoying the universe appearing to darken around me while my research observations get under way. Long ago I used to suggest that people make a pinhole pro … 続きを読む →