How can gravitational lensing be used to find planets?

Answer 1

When they pass in front of them, the light bends.

The lensing effect is caused by light traveling from its source and bending around any object of substantial gravity it passes by. This is also how black holes are found.

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Answer 2

Nolan Aldridge

Through a process known as microlensing, which occurs when a planet passes in front of a far-off star and momentarily magnifies its light, astronomers can detect the presence of planets around far-off stars in distant galaxies, even though the planets themselves are not directly visible. This technique is known as gravitational lensing.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.