1 / 57

Beyond Our Solar System

Beyond Our Solar System. Ch. 25. star : a body of gases that gives off a tremendous amount of radiant energy in the form of light and heat. Star Groups. constellations : a group of stars that form a pattern in the sky (88 different ones). Orion. Ursa Minor. Ursa Major.

marty
Télécharger la présentation

Beyond Our Solar System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Beyond OurSolar System Ch. 25

  2. star: a body of gases that gives off a tremendous amount of radiant energy in the form of light and heat

  3. Star Groups • constellations: a group of stars that form a pattern in the sky (88 different ones)

  4. Orion

  5. Ursa Minor Ursa Major

  6. Composition and Temperature • stars differ in size, density, mass, and composition

  7. color of a star depends on its surface temperature • hot stars areblue(average surface temperature 35,000 K) • cool stars arered(average surface temperature 3,000 K) • our sun isyellow(average surface temperature 5,500 K)

  8. Parallax • the slight shifting of the apparent position of a star due to the orbital motion of Earth. • the nearest stars have the largest parallax angles, while those of distant stars are too small to measure.

  9. Original Photo Photo taken 6 months later

  10. Distance to Stars • light-year: the distance light can travel in one year (9.5 trillion km) • it takes 8 minutes for the sun’s light to reach Earth • closest other star- Alpha Centauri (4.3 l.y.a)

  11. Motion • actual motion: must be measured only with a telescope • apparent motion: motion due to the Earth’s movement

  12. Stellar Magnitudes • apparent magnitude: how bright a star appears from Earth- the lower the number, the brighter the object • absolute magnitude: how bright a star really is

  13. Distance, Apparent Magnitude, and Absolute Magnitude of Some Stars

  14. Life Cycle of a Star

  15. nebula: a cloud of gas and dust

  16. protostar: shrinking, spinning, glowing nebula (temperature rises)

  17. Nuclear fusion begins- a star forms!

  18. main sequence star: longest stage of life cycle- nuclear fusion releases energy

  19. red giant: very large, cool bright stars- starts when hydrogen is used up- star cools and outer layers expand- size is 10x’s bigger than our sun- this is next stage of our sun!

  20. white dwarf: small, hot, dim star- outer gases are lost and only core remains

  21. supergiant: extremely large, cool giant stars- very bright- 100 x’s larger than the sun

  22. supernova: star that blows apart with a tremendous explosion- occurs in very massive stars

  23. neutron star: collapsed core of a supernova- dense ball of neutrons

  24. black hole: hole in space with gravity so great that not even light escapes- formed from collapsed supernova

  25. Classification of Stars H-R Diagram: graph plotting surface temperature and absolute magnitude of each star

  26. galaxies: large scale groups of stars held together by gravity • there are 50 billion-1 trillion galaxies • we are in the Milky Way galaxy

  27. Images of the Milky Way Galaxy

  28. Types of Galaxies • spiral: bright center of stars with arms spiraling out • Milky Way is a spiral

  29. Andromeda Galaxy

  30. Structure of the Milky Way

  31. barred spiral: have a group of stars making a bar through the center

More Related