This means it can’t be seen by telescopes or any instrumentation that astronomers use to observe the cosmos.
If it exists, dark matter exerts gravity, but it doesn’t emit light or any form of electromagnetic radiation. The most common explanation for this observational conundrum is a so-far undiscovered form of matter: dark matter. When astronomers measure the orbital speed of stars in galaxies at a range of distances from the center, they find that the stars are moving so fast that galaxies should be torn apart. At any fixed distance from the center of the galaxy, stars moving faster require stronger gravity to hold them in that orbit. Like our solar system, they rotate, with stars marching in stately paths, orbiting the galactic center. Galaxies are collections of stars held together by gravity.
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