Scientists suggest that a fifth, hidden force linked to dark energy may exist in the solar system but has not yet been ...

Scientists are grappling with a cosmic mystery: why does the Universe behave differently on massive scales compared to our ...

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

Rather than slowly condensing over millions of years, the first building blocks of Earth and other planets may have formed ...