Biology, 12.07.2019 17:00, drivinghydra

Which kind of wave would be observed in outer space between planets, where there is very little matter? a. an electromagnetic wave, such as an x-ray b. an electromagnetic wave, such as a sound wave c. a mechanical wave, such as an x-ray d. a mechanical wave, such as a sound wave

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Which kind of wave would be observed in outer space between planets, where there is very little matt...