SciShow Space: what is gravitational lensing

Caitlin Hoffmeister, from SciShow Space, explains us what gravitational lensing is. Gravitational lensing is a process through which light gets bent in its path if it goes past a massive object like a star or like a galaxy. An object behind the star of galaxy might be seen even though you do not have direct line of sight.

Sometimes gravitational lensing shows the images greatly disported, multiplied or squashed, depending on what you look at and what is between you and the star you wanted to see. this phenomenon was first described by Einstein who said that is a mass big enough is able to bent space-time, then the light has to follow that space-time curvature, thus showing us an image like we would see it through a lend, most often very distorted.

Einstein, you are still great.

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