Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. Which is a logical conclusion about these electromagnetic waves? Their energy must be very Their frequency must be very low These waves can travel without a medium They only travel through a vacuum of space

The answer is; These waves can travel without a medium

This is because space is mainly vacuum (meaning it is 'empty' space without, medium). Therefore the electromagnetic waves that are able to reach us from stars mean that electromagnetic waves can travel through the vacuum of space. This is unlike sound (a mechanical wave) that requires a medium for its to transmit its energy.