How far does the solar system actually go, and what is out there?

Planet Saturn and the Sun (AI-generated) How far does the solar system actually go, and what is out there? Most people imagine the edge of the solar system somewhere near Pluto, a distant world that orbits the Sun at an average distance of about 40 times farther than Earth. For decades, Pluto felt like the […]

Why is Pluto no longer considered a planet anymore?

Illustration of Pluto (AI-generated) Why is Pluto no longer considered a planet anymore? Pluto didn’t change, but our definition of a planet did. For most of the 20th century, Pluto was taught as the ninth planet, until 2006 when astronomers refined the rules of planethood. Pluto no longer fit all of them, and as a […]