In a recent piece for my column The Universe, I wrote about the biggest black holes in the cosmos. Black holes are rather ...

Astronomers use many methods to determine this number, including gravitational lensing, the universe’s expansion rate, and ...

Determining the size of an Earth-size exoplanet by the amount of starlight it blocks hundreds of light-years away once was the realm of science fiction. Measuring the mass of such a small planet based ...

The molecular hydrogen ion H₂⁺ is the simplest molecule. This simplicity makes it a perfect study object for physicists, as ...