Across
- 1. Jupiter is the ___ planet of solar system
- 4. Astronaut is a space ___
- 5. Pluto is the ___ planet located in Kuiper belt
- 7. ___ are the digits of foot
Down
- 2. Neil Armstrong and Buzz Aldrin left their ___ on the moon
- 3. Mercury is ___ planet in solar system order
- 6. Distance between galaxies is measured in light ___
- 8. Earth is estimated to be 4.54 billion years ___
