The solar system might have a ninth planet. It is hiding far beyond Neptune. Scientists have been looking for it for years. They have not seen it yet. The evidence comes from strange orbits of small, icy bodies. These orbits suggest a large planet is pulling them with its gravity. A powerful telescope is almost ready. It is in Chile. The Vera C. Rubin Observatory wi...

You might think that Mercury is just our little neighbor. But it's not so simple. This small planet is brutal. It's so close to the Sun that it experiences extreme temperatures, from super hot to freezing cold. Plus, it's heavily beaten by solar radiation. So, imagine our excitement when the European Space Agency's BepiColombo probe got super close to Mercury for its...