The unit of force and pressure are called derived unit why

Identify the type of synthetic material used in each object

Which statement correctly describes the relationship between frequency and wavelength?

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?