Where does the solar system end and interstellar space begin? That's a question scientists have been working to answer using ...

The orbits of our planets and their moons indicate that planets might be missing from our solar system. According to more ...

Somewhere at the edge of the solar system a new Earth-sized world might be lurking, dubbed Planet Y. Astronomers have long proposed that there might be hidden planets beyond the Kuiper belt, a region ...

There have been plenty of attempts to resolve the "Hubble Tension" in cosmology. This feature describes how one of the most important variables in cosmology, the expansion of the universe, takes on ...