Exercise No. 3 Read each statement. Put a happy face if the statement is correct and a sad face if it is wrong. -1. Heat from the sun reaches the earth by travelling across millions of kilometers of empty space _2. Radiant energy from the sun makes life possible on earth. _3. Radiation is the transferring of heat through an empty space or vacuum. -4. Heat waves are invisible. 5. Heat cannot transfer through space.​