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Because they have been observed.

Not only by indirect means but also by optical means - when a planet moves across the front of a star.

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14y ago
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5mo ago

Scientists detect exoplanets by using methods like the transit method, where a planet passing in front of its star causes a temporary dimming of the star's light, or the radial velocity method, where the gravitational pull of an exoplanet causes its star to wobble slightly. These observations, along with advancements in technology and data analysis, have helped scientists discover thousands of exoplanets.

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Q: How do scientist know exoplanet exist?
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Scientist believe there are but none have been found yet. We are currently in the process of searching for an exoplanet in the habitable zone. Also Scientist believe bacteria life could exist on Mars and Saturn's Moon Titan.


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They are very difficult to detect as they cannot be seen directly; trying to see a relatively dark object (exoplanet) next to a very bright object (star) is virtually impossible. But they can be detected indirectly by several means:the star and the exoplanet orbit each other causing the star's location to "wobble"if the orbit of the exoplanet is in the plane of the earth/star then it will eclipse the star and these periodic dimmings of the star can be detectedthe star and the exoplanet orbit each other causing doppler shifts in the star's spectral linesetc.


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