CREATE TABLE table_42977 ("U.S. mission" TEXT, "Mass  ( kg ) " FLOAT, "Booster" TEXT, "Launched" TEXT, "Mission goal" TEXT, "Landing zone" TEXT, "Lat / Lon" TEXT)

What is the largest mass for Tycho Crater?
SELECT MAX("Mass (kg)") FROM table_42977 WHERE "Landing zone" = 'tycho crater'
SELECT MAX("Mass (kg)") FROM "table_42977" WHERE "Landing zone" = 'tycho crater'