Across
- 4. Surface made up of all points located at the same distance from a point called center.
- 6. When the planets rotate on temselves.
- 7. The planerary system of the sun, to which the Earth belongs.
- 8. Giant planet composed mainly of hydrogen and helium.
- 9. Curved trajectory (of a celestial body) having another celestial body as its focus.
Down
- 1. Geometrical figure that is a regular oval.
- 2. Giant planet made of ice. Two examples are present in our solar system : Uranus and Neptune.
- 3. Planet composed mainly of rocks and metal which generally has three concentric envelopes.
- 5. Pediodic return of a star to a point in its orbit.