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and you're actually looking back in time. Some of the stars you're looking at in the night sky now might not even exist anymore. You're just getting the light from them that may have been set this way maybe millions or billions of years ago. So for all you know, those stars, some of those stars may not be in existence. The fact that maybe other stars have taken their place, but the light from those stars hasn't had enough time to reach us yet. So light travels what? 299,000 to 292,458 metres per second, a hundred and eighty-eight miles per second. So which means that light that reaches us from some of these different obstacles and spaces older than when it was invented can take light from the sun, roughly 43, 44 minutes, probably Jupiter, about eight minutes or so to reach Earth. And it's just that it almost reaches a space much further away and complicates constellations for working out how long it takes to get here. So measuring how far it helps to see the space is not an easy process.