Download Star Systems and Galaxies Sect. 4

Star Systems and Galaxies
Sect. 4
Made by: Alberina Dreshaj,
Anna Doucette, Michayla Anja,
and Chelsea Merrill.
Binary Star
• Star systems that have two stars.
Open Clusters
A star cluster that has a loose, disorganized
appearance and contains no more than a
few thousand stars.
Eclipsing Binary
A system in which one star periodically blocks
the light from another star.
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.
Spiral Galaxies
Galaxies with bulges in the middle and
arms that spiral outward, like pinwheels.
Elliptical Galaxies
Galaxies that look like round flattened balls.
Irregular Galaxies
Galaxies that do not have regular shapes.
Quasars
An enormously bright, distant galaxy with a giant
black hole at its center.
Universe
All space and everything in it.
Scientific Notation
A mathematical method of writing
numbers using powers of ten.
3 Objectives
Objective number 1:
Define a star system.
A star system is a group of 2 or more
stars.
Objective number 2:
Identify the major types of galaxies.
The major types of galaxies are
spiral, elliptical, and irregular.
Objective number 3:
Explain how astronomers describe the scale of
the universe as all of space and everything in it.
Astronomers describe the scale of the universe as
all of space and everything in it by studying
everything in it such as objects as close as the
moon and as distant (far away) as quasars.
Checkpoints and Figures!
Interpreting DiagramsAlgol appears brighter when the
dim star of the binary star passes in
front of the brighter star and
eclipses it.
More checkpoints!
Checkpoint- Globular clusters are large groupings of older stars.
Checkpoint- A quasar is an enormously bright, distant galaxy with
a giant black hole at its center.
Interpreting Diagrams- The sun is located halfway out from the
middle.
Checkpoint- About 25,000 light-years.
Calculating- 3000000000000000000 meters.
Sect 4 Assessment.
1.a) A binary star is a star system that has 2 stars.
b) Yes, because each star system has 2 stars that are called double stars
or binary stars.
c) The term is appropriate because when the dim star goes in front of the
brighter star, it is eclipsing it and there are 2 stars.
2.a) Spiral, Elliptical, Irregular.
b) The milky way is a spiral galaxy.
c) Elliptical.
3.a) The scientific notation is a mathematical method of writing numbers
using power of 10.
b) How the scientific notation is useful to astronauts is it helps them
determine light-years.
c) The Cat’s Eye.
Thank you for watching!