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Transcript of Galaxies
The force that attracts a body toward the center of the Earth or toward any other physical body having mass. So gravity is a force that is pulling together all matter. It is a gravitational pull and it is extremely strong. The other act that is acting besides gravity is inertia, which is the act of something moving in a straight line unless it's being pushed or pulled.
Elliptical galaxies are round or elliptical shaped and is a circle that has been stretched wider in the middle. They have very little gas and dust. Since stars form from gas, little star formation occurs in elliptical galaxies. Most of their stars are old and red.
Spiral galaxies are pinwheel shaped. Also, most of them have black holes in the center. Spiral galaxies are made of lots of gas and dust.
A black hole is a region of space having a gravitational field so intense that no matter or radiation can escape. Black holes are cold remains of a former star so dense that no matter, not even light is able to escape it's powerful gravitational pull.
The cD galaxies are elliptical shaped and filled with tight star clusters. The Dwarf galaxies are elliptical or irregular shaped and can have many or few clusters. The "Ghost" galaxies don't give much light and look like ghosts of spiral galaxies.
~ Grant ~ Facilitator
~ Julianna ~ Facilitator
~ Naomi ~ Speaker
~ Damon ~ Scribe
~ Kyla ~ Scribe
~ Jamile ~ Getter
A galaxy is a vast collection of millions or billions of stars combined with gas and dust held together by gravitational attraction. A galaxy is usually containing several million to over a trillion stars. Also, galaxies are divided into three basic types: spiral, elliptical, and irregular galaxies.
Galaxy DOK Questions
- How would you compare the force of gravity on Earth and on the moon?
- How would you test gravity?
- Can you explain how gravity effects us on Earth?
Some galaxies that are observed cannot be classified as either elliptical or spirals. These galaxies have little symmetry in their structure and are termed irregular galaxies. Irregular galaxies have no particular shape and they are among the smallest galaxies which are filled with gas and dust.