user: Question: How can Planet, 51 Pegasi b be detected?
Columns: ['Planet', 'Planet Type', 'Semimajor Axis ( AU )', 'Orbital Period', 'Radial velocity (m/s)', 'Detectable by:']
Types: ['text', 'text', 'real', 'text', 'real', 'text']
Sample row: ['51 Pegasi b', 'Hot Jupiter', 0.05, '4.23 days', 55.9, 'First-generation spectrograph']
SQL:

assistant: SELECT "Detectable by:" FROM "Table" WHERE "Planet" = '51 Pegasi b';