[['planet', 'planet type', 'semimajor axis ( au )', 'orbital period', 'radial velocity (m / s)', 'detectable by :'], ['51 pegasi b', 'hot jupiter', '0.05', '4.23 days', '55.9', 'first - generation spectrograph'], ['55 cancri d', 'gas giant', '5.77', '14.29 years', '45.2', 'first - generation spectrograph'], ['jupiter', 'gas giant', '5.20', '11.86 years', '12.4', 'first - generation spectrograph'], ['gliese 581c', 'super - earth', '0.07', '12.92 days', '3.18', 'second - generation spectrograph'], ['saturn', 'gas giant', '9.58', '29.46 years', '2.75', 'second - generation spectrograph'], ['alpha centauri bb', 'terrestrial planet', '0.04', '3.23 days', '0.510', 'second - generation spectrograph'], ['neptune', 'ice giant', '30.10', '164.79 years', '0.281', 'third - generation spectrograph'], ['earth', 'habitable planet', '1.00', '365.26 days', '0.089', 'third - generation spectrograph (likely)'], ['pluto', 'dwarf planet', '39.26', '246.04 years', '0.00003', 'not detectable']]
Gliese 581c has a short Orbital Period than Saturn
[ENT] has a short [ENT] than [ENT]