Upper Primary spacecraft

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Across
  1. 2. gathering data from Pluto and Arrokoth
  2. 4. orbits earth and learns about the Universe
  3. 6. passes close to a planet but avoids its gravity
  4. 7. piggyback another spacecraft
  5. 8. Landers and Rovers are examples of these
Down
  1. 1. monitoring Earth's weather and environment
  2. 3. has a powerful propulsive system
  3. 4. studying surfaces of Titan
  4. 5. LANDER robotic vehicle studying interior of Mars