The 'ESA/ESO Astronomy Exercise Series', allows students to gain exciting hands-on experience in astronomy by making realistic calculations with data obtained by the world's best telescopes. The students measure and calculate the distances and ages of astronomical objects, among the most basic problems in modern astrophysics, using observations made by the NASA/ESA Hubble Space Telescope and ESO's Very Large Telescope. This is the cover of Exercise 1: Measuring the Distance to Supernova 1987A.

Credit: The European Space Agency and the European Southern Observatory