Which space telescope discovered the first confirmed exoplanet orbiting a sun-like star (51 Pegasi b)?
- Hubble
- Kepler
- Ground-based ELODIE spectrograph
- TESS
Answer: Ground-based ELODIE spectrograph
51 Pegasi b was discovered in 1995 using radial velocity method with ground-based ELODIE spectrograph at Observatoire de Haute-Provence, not a space telescope. Note: Question tests precision—no space telescope made this discovery.