"Objects in Space": HTML5 Crossword

Across

5. Irregular shaped rocky objects smaller than planets which orbit the sun in a belt between the orbits of Mars and Jupiter (8)
6. Groups of several billions to hundreds of billions of stars (8)
7. An infinitely dense object which is the remnant of a high mass star after nuclear fusion ceases within its interior (5,4)
10. (relatively) close-spaced groupings of large agglomerations of stars (8,8)
11. Objects made of rock and ice which make elliptical orbits across our solar system. They move close to the sun and then out to the Oort cloud way beyond the Kuiper belt (6)
13. Rocky objects smaller than planets which fall from space onto the earth (10)
14. A swollen, relatively cold star near to the end of its life (3,5)
15. A large, very hot star which burns out in just a few million years (4,5)

Down

1. Move in orbit around a star along a path unimpeded by other objects (7)
2. Spherical objects heated by nuclear fusion emitting e-m radiation for millions to billions of years (5)
3. Natural rocky objects or man-made objects which orbit around a planet (10)
4. Move in orbit around a star along a path impeded by other similar objects; most of these objects are in the Kuiper belt (5,6)
8. Large regions of space containing material with very low density where stars are born (3,7)
9. A very dense object which is the remnant of a medium mass star after nuclear fusion ceases within its interior (7,4)
12. A dense object which is the remnant of a low mass star after nuclear fusion ceases within its interior (5,5)