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How many known planets are in the Milky Way?

Answer 1

About 3,500 exoplanets have been discovered as of April 2017.

About 3,500 exoplanets have been confirmed by NASA as of April 2017. In addition, over 4,000 planets are candidate planets that have not yet been confirmed.

About 200 planets were found in a matter of days thanks to the Exoplanet Explorers project, which was launched by the website zooniverse.org. Volunteers search for patterns in light curves that signify a planet has transited its star.

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Answer 2

Ivy Allen

As of the latest estimates, there are approximately 100 billion planets in the Milky Way galaxy. However, it's important to note that this number is constantly being refined as new discoveries are made.

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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.