Source: Starfinder Core Rulebook p.509
Half-elves are Medium humanoids with both the elf and human subtypes.
Half-elves receive Skill Focus as a bonus feat at 1st level.
Half-elves are immune to magic sleep effects and receive a +2 racial bonus to saving throws against enchantment spells and effects.
Half-elves receive a +2 racial bonus to Perception skill checks.
Half-elves can see dim light as if it were normal light.