Space Exploration

3. Second-Largest planet in our solar system.
5. The point in the orbit of a planet, asteroid or comet at which it is closest to the Sun.
7. A small icy body that when passing close to the Sun, heats up and releases gases.
10. A cloud of gas and dust in space, appearing either bright or dark.
12. A measure of the total amount of energy emitted by a star per unit of time.
13. The boundary around a black hole beyond which no light or other radiation can escape.
14. Type of galaxy characterised by its flat, disk-like shape.
15. Term for the time when the Universe was very young and hot, where no stars had yet formed.
17. Star system consisting of two stars orbiting around their common center of mass.
18. One of Jupiter’s moons, known for its icy surface.

1. Study of the uni eres and its contents outside of Earth’s atmosphere.
2. A region of space time where gravity is so strong that nothing, not even light, can escape from it.
4. Galaxy that contains our solar system.
6. Remains of a massive star after it explodes in a supernova.
7. The name of the American space Shuttle that broke apart on re-entry in 2003.
8. A natural satellite
9. Astronomical model that describes the structure and evolution of the Universe
11. A dwarf planet in the Solar System, located in the Kuiper Belt.
15. A hypothetical type of matter comprising most of the matter in the universe, not yet directly observed.
16. The effect by which objects moving away from an observer have their light shifted towards the red end of the spectrum