Simplify the following text for a Grade 6 native English-speaking person.
Original: At 10.243 kg , Neptune 's mass puts the planet between Earth and the largest gas giants ; Neptune has seventeen Earth masses but just 1\/18th the mass of Jupiter .
Simplified: With a mass of 1.0243 kg , Neptune is an intermediate body between Earth and the larger gas giants : its mass is seventeen times that of the Earth but just 1\/19th that of Jupiter .