user: Question: What is the largest mass(kg)?
Columns: ['U.S. mission', 'Mass (kg)', 'Launch vehicle', 'Launched', 'Mission goal', 'Mission result']
Types: ['text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Pioneer 0', 38.0, 'Thor-Able', '17 August 1958', 'Lunar orbit', 'Failure – first stage explosion; destroyed']
SQL:

assistant: SELECT MAX("Mass (kg)") FROM "Table";