How long does core helium burning last in a star compared with core hydrogen burning?

You are standing on a boat. which of the following strategies will make the boat start moving? a. pushing the mast b. throwing some cargo out of the boat c. pushing the front ofthe boat d. pushing another passenger

What are the examples for scaler quantities

Hi , i am new here can anyone me out with this question why is space black after having so many shining objects like sun , moon , stars