1 / 6

Galaxies

Galaxies. Chapters 30.1 & 30.2. A. Variable Stars - stars that vary in brightness as they expand and contract at regular intervals. Cepheid variable stars – have long pulsation periods of between 1 and 100 days.

chinara
Download Presentation

Galaxies

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. Galaxies Chapters 30.1 & 30.2

  2. A. Variable Stars - stars that vary in brightness as they expand and contract at regular intervals. Cepheid variable stars – have long pulsation periods of between 1 and 100 days. - this longer pulsation period allows astronomers to calculate their distance from Earth.

  3. Video – Deep Space through Hubble (2:21 min) B. Types of galaxies 1. Elliptical galaxies 2. Spiral galaxies The giant elliptical galaxy ESO 325-G004. (Wikipedia) An example of a spiral galaxy, the Pinwheel Galaxy (also known as Messier 101 or NGC 5457) (Wikipedia)

  4. 3. Barred-Spiral galaxies 4. Irregular galaxies NGC 1300, an example of a barred spiral galaxy. (Wikipedia) NGC 1427A, an example of an irregular galaxy about 52 Mly distant. (Wikipedia)

  5. C. The Milky Way Galaxy - The Milky Way Galaxy is a typical spiral galaxy containing about 100 billion stars. - The galaxy measures about 100,000 light-years across. - The older stars are located in the center of the galaxy with the younger stars in the spirals. Our Sun The Milky Way Galaxy (Wikipedia)

  6. - The Milky Way belongs to a small cluster of galaxies called the local group. - The Andromeda and Milky Way are the largest members of the Local Group The Sun’s neighbors. (Wikipedia)

More Related