Imagine spacetime is a giant trampoline. If you place a heavy bowling ball in the center, the fabric dips down. Now roll a marble near the ball. The marble does not go in a straight line. It follows the curve of the dip. Light acts like that marble. Even though light has no weight, it must follow the curved path created by the dip. This happens because massive objects, like stars and black holes, bend the space around them. Light simply travels along this curved road. Scientists first proved this during a solar eclipse in 1919. They saw stars appear slightly out of place. This discovery helped prove Albert Einstein was right about how gravity works. It shows us that space itself is not just empty nothingness. Space is a flexible fabric that bends under weight. When light passes near something huge, it bends around the dip. This bending lets us see objects that would otherwise be hidden. It is like looking through a giant glass lens made of gravity.
Examples
- During a solar eclipse, we can see stars that are actually behind the Sun because the Sun's gravity bends their light toward us.
- A black hole acts like a giant funnel, pulling light in so strongly that we see a dark circle where no light escapes.
- Galaxy clusters act like big glass lenses, stretching the light from distant galaxies into long, bright arcs.
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