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Are there any brown dwarfs optically visible from Earth?

Answer 1

Optically no. We know they are there from their infrared spectrum that we can detect with specialized detectors.

Brown dwarfs are basically failed stars because they lacked the mass necessary to fuse together and form stars, which is how visible light is produced.

Therefore, no, brown dwarfs are not optically visible. However, they do emit infrared and other less energetic waves because they are still hot, which causes them to produce energy waves, which can be detected by Earthly detectors and used to study brown dwarfs.

See https://tutor.hix.ai for additional information about brown dwarfs and their detection.

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Answer 2

Parker Albertson

Since brown dwarfs emit very little light in the visible spectrum, they are not optically visible from Earth. However, some brown dwarfs can be found with infrared telescopes.

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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.