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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We thought gravity was like a magnet. Two magnets pull each other closer. In this example, mass would be what makes a “magnet” work. But actually, gravity changes the shape of space, like a ball on a stretched out sheet. Two balls sitting on a sturdy flat surface won’t “pull” each other in. Two balls on an outstretch sheet however, will change the shape of the sheet, causing them to roll towards each other.
Light is a ball that doesn’t change the shape of the sheet, but it still follows the shape of the sheet.
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