A supernova is a large explosion that takes place at the end of a star's life cycle. Although supernovas only burn for a short amount of time, they can tell scientists a lot about the universe. Scientists use electromagnetic waves to detect supernovas. Why are electromagnetic waves used instead of sound waves?
A. Electromagnetic waves are created by physical vibrations.
B. Electromagnetic waves travel slower than sound waves.
C. Electromagnetic waves can travel in vacuums.
D. Electromagnetic waves cannot be absorbed.

Electromagnetic wave is a transeverse wave in which both the electric field and magnetic field travel simultaneously.
The electric field and magnetic field are perpendicular to each other and perpendicular to the direction of prapagation of the EM wave.

Electromagnetic wave is created from the oscillation of any charge particles like electron, proton, ions etc. .

The speed of electromagnetic wave in vacuums is maximum that is 3×10⁸ m/s. (Speed of EM wave is much more than that of sound (340m/s)).
In any other medium, its speed changes and it depends on the refractive index of that medium.

In any medium, the electromagnetic wave is absorbed to some extent except ideal vacuum. Also in vacuum in space, it's absorbed; because the vacuum in space is not completely vacuum since it contains few molecules per cubic kilometers.
However, the electromagnetic wave can travel in any medium even in vacuum while the sound wave can travel only in particle medium.

Thus we conclude that scientists use electromagnetic waves to detect supernovas because electromagnetic waves can travel in vacuums.

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