Diffraction gratings act like a prism and spread light out into a spectrum or a rainbow. This kind of spectrum is called a continuous spectrum. This kind of spectrum is called an emission spectrum. A constellation is a group of stars named by ancient astronomers. An asterism is a group of stars which is inside a single constellation or a group of stars in several different constellations.
Mnemonics are formulas or aids to help in remembering.
Mizar actually consists of five stars. So the Mizar system has a grand total of 5 stars. For High school students. Foucault pendulum outside if possible, spin chair show keep same orientation.