At the end of this activity, students should be able to: û recognise a few of the best-known constellations. û explain the concept of stellar parallax. û define the parsec and the light year. û explain the difference between apparent magnitude and absolute magnitude. û describe the radiation emitted by stars and explain how it can be used to estimate the surface temperature of a star. û name the spectral classes of stars. û describe an H-R diagram.

Originally released by Learnetic, 2016.