Teks 8.11C

2. a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter.
6. a theoretical stellar remnant, a white dwarf that has cooled down to the point where it no longer emits any light or heat
8. a star that spends the majority of its life fusing hydrogen into helium in its core.
9. a graph that plots the absolute magnitudes (or luminosities) of stars against their surface temperatures
10. flat, thin, and circular like a disk.
11. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
12. the energy source of the Universe, occuring in the core of the Sun and stars

1. all existing matter and space considered as a whole; the cosmos
2. is an interaction between two nuclear particles or two nuclei that results in the formation of new nuclei different from the original ones
3. a small very dense star that is typically the size of a planet.
4. a star that has expanded significantly in size and luminosity compared to a main-sequence star of the same surface temperature
5. Spectral classes are a way of classifying stars based on their surface temperature, and they are denoted by letters
7. the intrinsic brightness of a celestial object (as distinct from its apparent brightness diminished by distance).
8. the name of the galaxy that our solar system is a part of. It's a barred spiral galaxy containing billions of stars, including our Sun, and numerous planets.