2. A _____________ is a group of stars that, when seen from Earth, form a ________ in the sky. There are 88 named constellations. Here are some of the most popular. Can you see it? How about now? Leo the Lion constellation pattern

3. The Big Dipper (not really a constellation, it is a highly visible part of the full constellation know as __________.) Can you see it?How about now? Ursa Major

4. The Little Dipper is a group of stars (an asterism) in the constellation Ursa Minor (The Little Bear). This group of stars ends at ________, the pole star of the Northern Hemisphere. Polaris

5. Here you can see the relationship between the position of the Little Dipper and Big Dipper. (Top)

6. This image was taken by astrophotographer Akira Fujii and shows the Ursa Major in the lower right, and Ursa Minor to the left of center.

7. The constellation Orion the Hunter Can you see it?

8. The brightest and most visible constellation in the Southern Hemisphere is the ______________. Southern Cross

9. The largest constellation is Hydra (The Water Snake) which extends over 3% of the sky.

10. A _______ star is a system of ____ stars that _______ around each other. About half of all stars are in a group of at least two stars. Polaris, the brightest star in the constellation Ursa Minor, is part of a binary star system. (Below) binary two revolve

11. This is a binary star system known as J0806, it has two white dwarf stars orbiting each other. This is an animation of Algol B orbiting Algol A.

12. The triple star system 40 Eridani. Some stars are a part of a ______ or quadruple star system. Triple systems appear to be _______ stars that have trapped a single star into their ______. triple binary orbit

13. A _______ is a large system of stars, dust, and gas held together by _______. There are a wide variety of galaxies that are in many shapes and sizes. They are classified into three main types. galaxy gravity

14. The first type of galaxy is a ______ galaxy. These galaxies have a _____ disk with a ________ center surrounded by _______ arms. The center disk includes stars, planets, dust, and gas. These objects are __________ around the galactic center. The large spiral galaxy NGC 1232 spiral flatbulging spiral rotating

15. Our Solar System is located in a spiral of the __________________. Milky Way Galaxy

16. M101 Galaxy is twice the diameter of our Milky Way galaxy. One-Armed Spiral Galaxy NGC 4725

17. The universe’s ________ known galaxies are the ________ galaxies. These are galaxies with a ________, elliptical shape. They are generally round but stretch longer along one axis than along the other. NGC 1316 largest elliptical smooth

18. The stars found in elliptical galaxies are often very ____ and are not actively _________ new stars. The stars found in the elliptical galaxies are often ______ together making the center look like one giant star. old close creating

19. The Sombrero Galaxy

20. Messier 110 is a dwarf elliptical galaxy.

21. Galaxies that are not spiral or elliptical are called _________ galaxies. They have no defined ______ or structure. They may have been formed from one galaxy _________ with another. irregular shape colliding

22. 'The Bird” is a triple merger of galaxies.

23. Some galaxies are clumped together in small groups. Our Milky Way Galaxy is a part of “The Local Group” of about 30 galaxies.

24. Groups of stars that have a common origin and are held together by gravity are ____________. There are two types of star clusters, _____ clusters and ______ clusters. M55: Star Cluster A cluster of about 100,000 stars. star clusters open global

25. _____ clusters are the most __________ and are found toward the _______ of the galaxy. These clusters contain _______ stars and some stars still in formation. A bright, young open cluster in the Rosette Nebula Open numerous center young

26. The Pleiades Star Cluster Perhaps the most famous star cluster on the sky, the Pleiades contains over 3000 stars, is about 400 light years away, and only 13 light years across.

27. Thousands of young stars are nestled within the giant nebula NGC 3603. This is one of the most massive young star clusters in the Milky Way Galaxy. https://www.spacetelescope.org/videos/heic1009b/

28. The Quintuplet Star Cluster - One of the largest young clusters of stars in our Milky Way galaxy.

29. ______ clusters are ball-shaped star systems that contain anywhere from tens of thousands to one million stars. They are most heavily concentrated at the _______ of the cluster. These clusters are estimated to be 10 to 13 billion years old. Global center

30. Massive globular cluster – Abell 1689

31. Quasars are some of the most _______ objects in our known universe. They are extremely bright masses of _______ and ______ that emit radio waves, x-rays, and light waves. A Milestone Quasar distant energy light

32. A quasar is believed to produce its energy from massive ___________ in the center of the galaxies in which the quasar is located. Because of their ______ distance from Earth, they cannot be seen with the naked eye from Earth. A quasar portrait gallery from NASA black holes great

33. Not only can you find groups of stars in our universe, groups of galaxies can also be identified. A _____________ is a group of galaxies under the same _____________ influence. galaxy cluster gravitational

34. The galaxy cluster know as Abell 2218

35. Because of the lack of elliptical galaxies, the Hercules cluster is considered a young cluster.

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