What are parsecs?

A parsec is a way to measure how far away stars are from us, like using steps to count how far you walk.

Imagine you're playing with your toy car on the floor. You place it 1 meter away, then you look at it through a cardboard tube (like a telescope). Now move your car farther away, say, 10 meters. It looks smaller and less detailed from that distance. Astronomers use a similar idea to measure how far stars are.

A parsec is based on something called triangulation. Imagine you're standing in one spot, then you walk 1 meter away, that’s like moving from one eye to the other. If a star looks like it shifted by about 1/3600th of a degree when you move that 1 meter, we say it's 1 parsec away.

It might sound complicated, but think of it like this: if your friend is standing across the room and you blink one eye and then the other, they seem to shift slightly. The farther they are, the less they shift. Astronomers use that shifting to tell how far stars really are, and that distance is measured in parsecs! A parsec is a way to measure how far away stars are from us, like using steps to count how far you walk.

Imagine you're playing with your toy car on the floor. You place it 1 meter away, then you look at it through a cardboard tube (like a telescope). Now move your car farther away, say, 10 meters. It looks smaller and less detailed from that distance. Astronomers use a similar idea to measure how far stars are.