Exoplanets are difficult to find. They do not emit light like stars, they are too small to block large areas of background light like interstellar clouds, and their mass is so small that their gravitational pull does not affect their surroundings anywhere close to the degree that dark matter can.
The Search for Signs of Life on Exoplanet Documentary - Find New Planets in the Universe
Exoplanets are difficult to find. They do not emit light like stars, they are too small to block large areas of background light like interstellar clouds, and their mass is so small that their gravitational pull does not affect their surroundings anywhere close to the degree that dark matter can.
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