CREATE TABLE table_20159 ("U.S. mission" CLOB, "Mass  ( kg ) " FLOAT, "Launch vehicle" CLOB, "Launched" CLOB, "Mission goal" CLOB, "Mission result" CLOB)

What is the largest mass(kg)?
SELECT MAX("Mass (kg)") FROM table_20159
SELECT MAX("Mass (kg)") FROM "table_20159"