The halo, known as an Einstein ring, encircles a galaxy 590 million light-years away, considered close by cosmic standards. A light-year is 5.8 trillion miles. Astronomers have known about this ...

We continue to rate the Oura Ring 4 as the best smart ring available right now. However, due to its mandatory subscription, it’s also an expensive option. This means that the Ultrahuman Ring Air ...