Across
- 2. a massive system of stars, stellar remnants, interstellar gas, dust, and dark matter; all bound together by gravity
- 4. a galaxy with no distinct, regular shape; appear chaotic/lack central bulge or spiral arms; rich in gas & dus - promotes active star formation
- 5. the relationship between a model or representation and the real object; system for measuring or classifying phenomena
- 6. a type of galaxy with a smooth, featureless shape that resembles an ellipse; contains mostly old stars and has little to no ongoing star formation; thought to form from collision/merger of other galaxies
- 9. star a type of pulsating star that brightens and dims over a regular period; predictable cycle linked to luminosity
- 10. a type of galaxy with a flat, disk-like shape featuring a bright, central bulge and arms that curve outward, resembling a pinwheel; contains billions of stars, gas, dust & a large amount of dark matter [crucial for structure & stability] - barred: contains a bar-shaped structure of stars that connect the galaxy’s nucleus to its spiral arms
Down
- 1. all of space, time, matter, and energy; including all planets, stars, galaxies, and other forms of matter
- 3. (AU) the average distance between Earth and the Sun; about 93 million miles
- 7. a unit of distance equal to the distance light travels in one year [appx. 5.88 trillion miles]
- 8. cluster a large, spherical, and dense collection of thousands to millions of old stars that are tightly bound together by gravity