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Unseen planets kick a ring of debris off-kilter around a nearby star
Unseen planets kick a ring of debris off-kilter around a nearby star,One of the more amazing things about astronomy is how it acts like a time machine.  For example, we sometimes see things so far away that it takes light billions of years to reach us, so we see that object as it was when it was young.  But in another way, we can travel in time by looking at a star that is very similar to but far younger than the Sun is now. It’s not perfect, but it does give us an idea of what our nearest star was in its youth.

Unseen planets kick a ring of debris off-kilter around a nearby star

One of the more amazing things about astronomy is how it acts like a time machine.  For example, we sometimes see things so far away that it takes light billions of years to reach us, so we see that object as it was when it was young.  But in another way, we can travel in time by looking at a star that is very similar to but far younger than the Sun is now. It’s not perfect, but it does give us an idea of what our nearest star was in its youth.