The number of planets that orbit the sun depends on what you mean by “planet,” and that’s not so easy to define ...

“Our Solar System’s Kuiper Belt long appeared to ... for objects was complicated by being located in front of the dense background of the galaxy’s center. But now that it’s located in ...

The European Space Agency (ESA) has released an audio-visual representation of solar activity over the last three years, pulling data from its Solar Orbiter probe, which it runs with NASA.