Across
- 4. a celestial body distinguished from the fixed stars by having an apparent motion of its own
- 6. exoplanet is a planet that orbits a star outside the solar system.
- 7. a celestial object, thought to be a rapidly rotating neutron sta
- 13. a group of stars forming a pattern
Down
- 1. massive and extremely remote celestial object.
- 2. A meteoroid is a small rocky or metallic body in outer space.
- 3. A cloud of gas and dust in outer space
- 5. an astronomical object comprising a luminous spheroid of plasma held together by its gravity.
- 8. matter consists of elementary particles which are the antiparticles of those making up the normal matter.
- 9. A system of millions and billions of stars, together with gas and dust.
- 10. Earth's only natural satellite.
- 11. a star showing a sudden large increase in brightness and then slowly returning to its original state over a few months.
- 12. a small or large rock orbiting the sun.