Year 9 8a Space

2. a celestial body that orbits a star, has enough mass for its own gravity to create a nearly round shape, and has cleared its orbital neighbourhood of other objects.
4. The first stage all stars go through after forming from a nebula. In this stage the star becomes hot enough for hydrogen nuclei to fuse.
6. a massive, luminous sphere of plasma held together by its own gravity, sustained by nuclear fusion in its core
7. The galaxy in which our solar system is located.
9. The stable state of all stars. The gravitational forces pulling the star together, and the pressure pushing outwards, are balanced.
11. a celestial body orbiting the Sun that is massive enough to be rounded by its own gravity but has not cleared its orbital neighbourhood of other debris
12. A cloud of dust and gas.
14. When their hydrogen is used up and larger nuclei are produced by fusion, stars of a similar magnitude to the Sun will expand.
15. a region of spacetime where gravity is so intense that nothing, not even light, can escape
16. The explosion of a massive star, that distributes the elements created by the fusion reactions in the star, throughout the universe.

1. a gravitationally bound system consisting of the a star and all the objects that orbit it, including planets, their moons, dwarf planets, asteroids, comets, and cosmic dust
3. The moons that orbit planets.
5. is a massive bound system consisting of stars, stellar remnants, interstellar gas, dust, and dark matter
8. When the fusion reactions in stars of a similar magnitude to the sun come to an end, the star will contract under gravity and cool down.
10. the incredibly dense, city-sized remnant core left after a massive star explodes in a supernova
13. Man-made satellites that have been sent into space for purposes such as satellite imaging and communications.