Science Vocabulary

4. / A large cloud of gas and dust in space
6. / a group of huge single stars, star systems, etc. held together by gravity
8. magnitude / the magnitude of a celestial object as it is actually measured from the earth
9. galaxies / a type of galaxy having an approximately ellipsoidal shape and a smooth, nearly featureless image
11. / the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object
16. / the repetitive variation, typically in time, of some measure about a central value
17. Russel diagram / A graph relating the surface temperatures and absolute brightness
19. / the SI base unit of thermodynamic temperature, equal in magnitude to the degree Celsius.
20. / a fixed luminous point in the night sky that is a large, remote incandescent body like the sun

1. reaction / a change in the identity or characteristics of an atomic nucleus that results when it is bombarded with an energetic particle, as in fission, fusion, or radioactive decay.
2. body / An astronomical object or celestial object is a naturally occurring physical entity, association, or structure that exists in the observable universe
3. Bang Theory / The theory of the explosion that started the expansion of the universe
5. / the distance between the two corresponding parts of a wave
7. magnitude / the magnitude of a celestial object as it would be seen at a standard distance of 10 parsecs
10. / how cold or hot something is
12. galaxies / A galaxy with a bulge in the middle and arms that spiral outward in a pinwheel shape
13. / an apparatus for producing and recording spectra for examination
14. / all of space and everything in it
15. galaxy / A galaxy that does not have a regular shape
18. Way / the galaxy we are living in right now