Transcript Chapter 21 Vocabulary PowerPoint Presentation

Chapter 21 Vocabulary
PowerPoint Presentation
By: Champa Dulal, Kelsey Dunn,
Kamal Dangal, and Lachi Dahal.
Section 4 Star Systems and
Galaxies.
Binary Stars
• Star Systems that have two stars are
called double stars or Binary Stars.
• Some binary stars are called eclipsing
binaries.
Are All binary stars part of a star
system?
Explain why the term “ Some binary
stars are called Eclipsing binaries”
appropriate?
• Yes, most stars are members of groups of two or more
stars, called star system.
• It is the appropriate term because ones star in an
eclipsing binary sometimes blocks light from the other
stars.
Eclipsing Binary
• A system in which one star periodically
blocks the light from another.
• Figure 16 Eclipsing Binary- Algol is an
eclipsing binary star system consisting of a
bright star and a dim companion. Each
time the dimmer star passes in front of the
brighter one, Algol appears less bright.
When does algol appear brighter?
• Algol appears brighter when the dim
companion star passes behind the brighter
star.
Open Clusters
• A loose, disorganized appearance and
contains no more than a few thousand
stars.
• They often contain many bright super
giants and much gas and dust.
Globular Clusters
• Large groupings of older stars.
Galaxy
• A huge group of single stars, star systems,
star clusters, dust, and gas bound together
by gravity.
What are the main types of
galaxies?
• The main types of galaxies are galaxy,
Spiral Galaxy, Elliptical Galaxies, and
Irregular Galaxies.
How far away is the center of the
galaxy?
• The center of the galaxy is about 25,000
light-years away, but it is hidden from view
by large clouds of dust and gas.
Spiral Galaxies
• Have a bulge in the middle and arms that
spiral outward, like pinwheels.
• The spiral arms contain many bright young
stars as well as gas and dust.
Elliptical Galaxies
• Galaxy contains billions of stars but have
little gas and dust between the stars.
• Most elliptical galaxies contain only old
stars.
Irregular Galaxies
• A galaxy that doesn’t have a regular shape
and that are smaller than other types of
galaxies.
• They generally have many bright, young
stars and lots of gas and dust to form new
stars.
Quasars
• A bright object that is 10 billion light-years
or more away, making them among the
most distant objects in the universe.
• Look almost like stars.
• Since Quasi means “something like” in
Latin, these objects were given the name
quasi-stellar objects, or Quasars.
Universe
• All of space and everything in it.
• The universe is enormous, almost beyond
imagination.
Scientific Notation
• A mathematical method of writing numbers
using powers of ten.
• The power of ten to write very large or
very small numbers in shorter form.
Other Information.
Our solar system is located in a
spiral galaxy called the Milky Way.
How large is the cat’s eye nebula in
a light-year?
• Cat’s eye nebular is about
30,000,000,000,000,000 meters across, or
3x10 to the power of 16 m.
Thanks to Mrs. Keller for helping
us with this presentation. We
couldn’t do it without your help.
We hope you like this we worked really hard on it,
Claps to Kelsey Dunn she was a great leader.