Space

2. objects natural object which is located outside Earth's atmosphere
4. An American astronomer instrumental in development of contemporary stellar constellation
5. measure of the level of ionizing radiation present in the environment at a particular location
6. anything that occupies space and has mass
7. an increase or decrease in the frequency of sound,light,or other waves
9. nature of something's ingredients or constituents
12. displacement of spectrallines towards longer wavelengths
13. atomic number greater than 92
14. an optical instrument used to observe distant objects
15. something that is accepted as true without proof
16. origin and development of the universe
17. proved objects were actually galaxies
22. contains our solar system
23. theory an explanation of an aspect of the natural world that can be repeatedly tested and verified
26. force by which a planet or other body draws objects towards its center
27. first person to walk on the moon

1. two or more atomic nuclei formed
3. Danish chemist and astronomer
8. instrument used to measure properties of light over a specific portion of the elctromagnetic spectrum
10. cosmological model of the observable universe
11. spherical region of universe comprising all matter observed from Earth
18. theory of exponential expansion of space in the early universe
19. used to distinguish the physical matter of the universe
20. where all the stars and everything are
21. self-contradictory statement or proposition that when investigated or explained may prove to be well founded or true
23. large group of smaller galaxy clusters
24. lowest temperature
25. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction