If a satellite or spaceship explodes in outer space, you can see the explosion from a distance but you cannot hear it. why?
a) light waves travel very fast and sound waves travel much slower.
b) sound waves transmit energy while light does not transmit energy.
c) sound is a mechanical wave and needs a medium to travel through while light is an electromagnetic wave.
d) light is a mechanical wave and needs a medium to travel through while sound is an electromagnetic wave.

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.