Galaxies

3. We know that ____ in the center of a galaxy are an indication of the galaxies age.
4. a spiral galaxy with a central bar-shaped structure made of stars.
6. generally shaped and that has no apparent internal structure or spiral arms
8. edwin hubble created a classification system for ______that has been used for several decades
10. whose supermassive black hole is the first black hole to be imaged by the Event Horizon Telescope
11. can lead to the galaxies merging to become 1 huge
14. a galaxy with no specific form and a relatively low mass.
15. Galaxies are collections of stars, gas, dust and ___________ held together by gravity
16. There are __________“official” constellations in the milky way galaxy
18. in the constellation Triangulum.
19. The he Andromeda, our Milky Way and the Triangulum Galaxy are the ________ galaxies
20. Hubble reveals an estimated ___________________ galaxies in the universe or so

1. was one of the leading astronomers of the twentieth century. His discovery in the 1920s that countless galaxies exist beyond our own Milky Way galaxy revolutionized our understanding of the universe and our place within it.
2. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms
5. known as SagDig, is the member galaxy furthest from the center of mass of our Local Group of galaxies.
7. Barred spiral galaxies were discovered by Edwin Hubble whom the Hubble space _______ is named after.
9. Almost every galaxy, including our Milky Way, has a _________________at its heart
12. we live in the ______ galaxy
13. The closest known galaxy to us is the _____________ Galaxy
17. most galaxies are _______ from their designation in a catalogue