The atmosphere, a thin veil of molecules enveloping Earth, reaches about 20 miles (32 kilometers) above the planet's surface.

We like to believe we have a pretty good idea of how things work in our universe. However, the truth is that there is still ...

Now, to the dismay of researchers, a new study designed to double-check the calculated rate of the universe's expansion – aiming to determine whether or not the initial readings were flawed ...

Dark energy is one of the greatest mysteries of the universe. This mysterious force is thought to be accelerating the expansion of the cosmos. But a new study challenges this long-held belief.