Can anything reflect x-rays or gamma rays?

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?

What occurs during a combustion reaction

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?