The document summarizes key facts about the Milky Way galaxy and the universe:
1) A constellation is a group of stars that appear close together but are not actually physically close. Constellations help people navigate the night sky.
2) A light year is the distance light travels in one year, around 6 trillion miles. The closest star to our solar system, Proxima Centauri, is about 4 light years away.
3) A galaxy is a large group of stars bound together by gravity. Our Milky Way galaxy is a spiral galaxy estimated to contain 200 billion stars.
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have fun using these activities I got from the web and this is my first word document send to slideshare. Hope you have fun and don't forget to give this a like!
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2. A constellation is a group of stars than appear to be together but are not. They seem to form a picture in the sky. People use them to find their way around the sky like someone using objects to get from place to place.
3. Orion the hunter The constellation looks flat but all the stars are at different distances from us.
4. Leo the Lion Cygnus the Swan Can you see the drawing ?
6. The Zodiac is a special group of constellations that extend out from Earth’s equator.
7. Astronomers want to know how far away stars are! From here on earth, they all look the same distance. In fact, ancient people thought they were all “stuck” on a glass sphere.
8. To measure the distances in space, astronomers use a light year. A light year is the DISTANCE light travels in one year. One light year is equal to a little under 6 trillion miles! (6,000,000,000,000) Proxima Centauri is the closest star to our solar system. It is about 4 light years away. Going the speed of light it would take us 4 years to get there. Traveling as fast as the average spaceship, it would take between 70,000 and 100,000 years to get there! Video clip on a light year
11. Star color Determined by surface temperature. Hottest are blue – coolest are red. Video clip on star colors
12. Absolute and apparent magnitude Absolute magnitude is how much light is actually given off by a star. Apparent magnitude is how bright a star appears to be due to how close or far away it is.
13. Two astronomers discovered a relationship between the absolute magnitude (real brightness) of a star and its surface temperature . They plotted the data on a graph. Ejnar Hertzsprung Denmark Henry Russell USA
14. So what does this show? Stars seemed to naturally group together
15. They discovered that stars grouped by type and during their lifetimes would move from one place on the graph to another. As our sun ages, it will move to a giant star to a white dwarf.
16. Life cycle of a star When a star forms it begins its “life.” When a star runs out of fuel, it dies. So a star has a life similar to a battery that cannot be recharged. When the battery runs out of energy, it is finished. Our sun will run out of energy and it will be finished too. But this will not happen for another 5 billion years! Video clip of life cycle of stars
17.
18. This diagram follows the life of both large and average stars. Video clip about neutron stars and black holes.
23. Notice the individual stars in the picture. They are not part of the galaxy in the picture but part of our own Milky Way Galaxy.
24. So why are they in the pictures? If you look out a window with wood trim, it is hard to get a view without them in the way. These stars are in our view as we are looking out of our galaxy!
27. Our Milky Way Galaxy is a spiral galaxy. We think! This is not really a picture of our galaxy – just one that looks like what we think our galaxy is like!
28. Why not? If you were inside Lanier Middle and had never been out of the building your entire life, would you be able to know what the school looked like from a distance? Of course not. All you could do is look out the windows and get some view of part of the building. If you looked out enough windows you might get a general idea but you could never know for sure if you were right about all its features.
29. Top view Side view Video clip on our location in the galaxy
30. Milky Way using a “fish eye” lens Notice the comet In the night sky, a band of stars can be seen across the sky as a blurry image. When you see this, you are looking into the part of the galaxy with more stars. Our view of the Milky Way
31. Every star we see in the night sky is in our own galaxy. We cannot see stars in other galaxies because they are too far away. The Milky Way is estimated to have 200 billion stars.
32. Nebulas are often named by what they look like! Witch head nebula Veil nebula Horse head nebula They provide the material for new stars to form.
34. Current estimate of the age of the universe is 13.7 billion years. The solar system is 4.6 billion years old. The solar system is not the same age as the entire universe .
35. Hubble deep field Click on the picture and watch as the Hubble telescope zooms in to an area just above the Big Dipper!