Across
- 2. This force pulls down and the strength depends on the mass of an object.
- 4. This is our main natural light source.
- 6. This is the farthest planet discovered by unaided human eye.
- 9. This planet is the oldest forming 4.5 billion years ago.
Down
- 1. This is our space neighbor hood, with 8 planets and 1 star.
- 3. The atmosphere is so dense the sun looks like a smear of light.
- 5. This planet’s tilt is 97.7 degrees.
- 7. This is the only planet not named after a Greek God.
- 8. This planet is the most researched by scientists.