Our place in the Galaxy Flashcards
Name some members of the Local Group.
The Andromeda galaxy
The Small and Large Magellanic clouds.
The Triangulum galaxies
What is the diagram that Erwin Hubble came up with to classify galaxies?
The TUning fork diagram
What does a b and c mean in the Tuning fork diagram?
Adding different Spiral galaxies by added letters a b and c.
What are the two main theories of galaxy formation?
Vast clouds of gas and dust collapsed gravitationally allowing stars to form.
Large lumps of matter were present in the young Universe. These clumped together under their mutual gravitation to form galaxies?
What is AGN?
Active Galactic Nuclei
What does it mean by a active galaxy?
Galaxies that emit huge amounts of radiation in wavebands such as radio and X rays.
What are the three types of active galactic nuclei?
Seyfert galaxies: They have bright nuclei and emit strong IR UV and X ray radiatio.
Quasars: They emit strongly in the UV and X ray regions and some are strong emitters of radio waves.
BL Lacenta objects - Blazars - Are compact quasars in which the galactic jets are pointing towards.
What is redshift?
It implies that galaxies are moving away from us not towards us.
What is Hubble’s law
The linear relationship between recession velocity and distance.
What is the equation for Hubble’s law?
v = H0D
What is H0 in Hubbles law?
It is Hubble’s constant.
What is evidence that supports the Big Bang Model?
The existence of quasars: implying that they lie great distances from us and were created when the universe was very young.
The cosmic wave microwave background: The early universe was hot and dense, it would have cooled as it expanded.
Hubble Deep field image: This was the first of a series of long exposuresWH image of empty space.
What are the theories of the end of the universe?
The universe will expand indefinity
Or
The universe will collapse in the Big crunch
What is a example of a blue shifting galaxy?
Andromeda galaxy.
