Across
- 3. a device that is used to obtain information from outer space and send it back to Earth
- 6. a device without people on it that is designed for travel or operation outside of the Earth’s atmosphere
- 12. spinning of a planet, moon, sun, or another object around its axis
- 15. sun-centered
- 16. a spherical region that surrounds the solar system
- 17. objects of rock, metal, and ice that are smaller than planets and revolve around the Sun
- 20. object that revolves around a larger object in space
- 21. a unit used to measure distances in the Solar System equal to the average distance between the Earth and Sun
Down
- 1. force of gravity between two objects increases as the mass of the objects increases and as the distance between them decreases
- 2. oval shaped
- 4. a small body from which a planet originated in the early stages of development of the solar system
- 5. a natural object that revolves around a planet
- 7. a piece of rock from space the enters Earth’s atmosphere and burns, creating a bright streak of light across the sky
- 8. the region of interplanetary space between the orbits of Mars and Jupiter in which most asteroids are found
- 9. solar system object made of ice, which follow a long, narrow orbit around the Sun dwarf planet: a celestial body similar to a planet by orbiting in a zone that has many other objects in it
- 10. one orbit of an object in space around another object in space
- 11. a relatively large spherical body that surrounds a star
- 13. a piece of a meteor that breaks off and lands on the Earth meteoroid: a relatively small, rocky body that travels through space
- 14. one of the large planets made mostly of gas geocentric: describes something that using Earth as the reference point gravitational force: force of attraction between two objects
- 18. rocky planets in the inner solar system
- 19. a rotating cloud of gas and dust from which the sun and planets formed