Simplify the following text for a Grade 12 native English-speaking person.
Original: The discovery was made using the radial velocity method at the Observatoire de Haute-Provence , using a tool called the ELODIE spectrograph that is used to find planets that are outside our Solar System .
Simplified: The discovery was made with the radial velocity method at the Observatoire de Haute-Provence , using the ELODIE spectrograph .