In the case of black holes, lights are pulled into by great gravitational force exerted by the dying stars (which forms into a black hole). If light has no mass, how is light affected by gravity?
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I’ll try a eli actually 5. Draw a straight line on a piece of paper, end to end. This is the straight line that light, and mass, and everything will take. Now pick up the paper and bend it into a curve. The line is still straight on the paper, the paper has just changed shape. If you curl the paper into a loop so the lines touch at each end, now you have an orbit. But the line is still straight. Believe it or not, the earth itself is traveling in a “straight” line, but the space it’s traveling through is curved around the sun.
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