Why is light affected by gravity if it has no mass?
In: 3548
Mass bends space.
Think of a train. Its going forward, its all it knows.
But if you curve the rail, the train will also curve, even though as far as it “knows”, its going forward.
This is really simplistic but may help.
EDIT:
Answering a question:
“If the space is bent, what remains in the area from which the space is bent?” from 14MTH30n3.
Imagine a weaving machine, with a lot of strings falling vertically parallel to one another. Like – a lot, just side by side without touching.
Now, with your finger pull some strings closer together. You’ll see others become more separated. But its still strings, separate, just curved in a different way. If you follow one of them, its still just the same string and, like the train, you won’t “feel” it change direction.
Its the same material, just… stretched. And you also are stretched – so far as you’re concerned, nothing changed.
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