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How do you determine how much an object has aged since its light left?
Wiki User
∙ 14y ago
The speed of light is absolute, so you begin there. You know the distance between the Earth and the sun (from celestial mechanics originally), so now you have a general idea of how long it takes for light from such an object to get to to your eyes.
Now you've spotted an object - a star, or distant galaxy, let's say - and ask how far away it is. You compare its light to that of objects (like the sun) that you know. A little math tells you that what you're seeing happened there a billion years ago.
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∙ 14y ago
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