Please HELP!! This is about physics and I don’t get it.

With these questions , 15 pts & brainliest

The seven sisters, seven stars located more than 400 light-years away in the taurus constellation can be seen here with venus and another constellation, orion. the seven stars stay grouped together but seem to move, like the planet venus. why do stars seem to move like planets in the night sky?

Which wave is the result of amplification and produces a louder sound