Many objects in space rotate. Earth completes a spin in roughly 24 hours, while Venus takes a whopping 243 Earth days. The moon's rotational period is about 27 days. The sun, it turns out, also ...

When we think about a day on Earth, we usually take it for granted that it lasts 24 hours. But in reality, Earth’s rotation is a bit different. It’s not fixed, and over time, even tiny shifts in how ...