Why the movies produced recently are about the alien attacks to the earth or type of armagedden?

       People made many movies about aliens recently.It constantly increases popularity of such movies.Space attracts people's attention because there are many things unknown about space so people  want to learn about space.It increased  research on this subject.There are several projects about space so it is a current topic.This is an opportunity for filmmakers.They can gain a lot of money from these movies.Also,imagination is unlimited in these movies so they can create imaginative movies.Science fiction movies are not ordinary and this movies appeals to people of all ages.Therefore,it has a broad audience.