Planets, moons, galaxies...

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Across
  1. 3. is the only natural satellite of the Earth
  2. 5. is the sixth-closest moon of the planet Jupiter, and the smallest of its four Galilean satellites, but still the sixth-largest moon in the Solar System
  3. 6. is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Named after the Roman god of agriculture
  4. 7. is the fifth planet from the Sun and the largest planet in the Solar System
  5. 12. is the sixth planet from the Sun and the second largest planet in the Solar System, after Jupiter. Named after the Roman god of agriculture
  6. 13. is the star at the center of the Solar System. It is almost perfectly spherical and consists of hot plasma interwoven with magnetic fields
  7. 14. is the third planet from the Sun, and the densest and fifth-largest of the eight planets in the Solar System. It is also the largest of the Solar System's four terrestrial planets. It is sometimes referred to as the world or the Blue Planet
  8. 15. is the fourth planet from the Sun and the second smallest planet in the Solar System. Named after the Roman god of war, it is often described as the "Red Planet" because the iron oxide prevalent on its surface gives it a reddish appearance
Down
  1. 1. is the innermost of the four Galilean moons of the planet Jupiter and, with a diameter of 3,642 kilometres, the fourth-largest moon in the Solar System. It was named after the mythological character Io, a priestess of Hera who became one of the lovers of Zeus.
  2. 2. is a massive, gravitationally bound system consisting of stars, stellar remnants, an interstellar medium of gas and dust, and dark matter, an important but poorly understood component
  3. 4. is the eighth and farthest planet from the Sun in the Solar System. It is the fourth-largest planet by diameter and the third-largest by mass. Among the gaseous planets in the solar system, Neptune is the most dense
  4. 8. is the seventh planet from the Sun. It has the third-largest planetary radius and fourth-largest planetary mass in the Solar System. Uranus is similar in composition to Neptune, and both are of different chemical composition than the larger gas giants Jupiter and Saturn
  5. 9. is an astronomical object orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimal
  6. 10. is the second planet from the Sun, orbiting it every 224.7 Earth days
  7. 11. is the largest asteroid and the only dwarf planet in the inner Solar System