2.2 Cosmology Flashcards
(14 cards)
What are the three types of evidence used to support the big bang theory
Red shift and blue shift, cosmic microwave background radiation, and the Doppler effect
Explain red shift and blue shift
Red shift - Light from stars moving away from us the light on emmision spectrum will shift towards longer wavelength - red.
Blue shift - Light from stars moving towards us will be compressed, making light bluer eg Andromeda Galaxy.
What is the doppler effect
If something is making noise and it’s coming towards you, the frequency or pitch sounds higher. If it’s moving away, the frequency/pitch sounds lower.
In astronomy, we can see that the light is being stretched to the red end of the spectrum hence it’s moving away from us.
What is cosmic microwave background radiation
It is the afterglow/radiation emitted as a result of the Big Bang. Big bang being hot, most energy would have been produced as high frequency radiation. As universe expands and cools this radiation has red shifted into the microwave of electromagnetic spectrum.
What is the large hadron collider and its purpose
The biggest particle accelerator ever. Purpose: To observe the particles interactions that might have occurred when the universe first formed.
What does the LHC do and where is it located
It uses large magnets to accelerate and guide protons along the LHC. When protons moving opposite directions are going fast enough they collide together imitating the BIg Bang Theory. Ring shaped tunnel 27km beneath France and Switzerland.
What is the SKA
Square Kilometer Array is a project and effort to build the worlds largest radio astronomy observatory. Designed to transform science that will change our understanding of the universe.
What are the two locations that have built SKAO
Two radio telescopes to observe the sky at different radio frequencies.
Australia - Ska LOW
South AFrica - SKa Mid
SKA Low
Located in Murchinson Radio astronomy Observatory in WA. Consist of many Christmas tree shaped antennas which will operate between 50 Hz and 350.
SKA Mid
Karoo region SA. Consist of dish antennas operating between 350 MHz and 14 GHz.
What will the SKA do
By spreading thousands of antennas it will enable fin resolution pictures to see the universe. Will give astronomers insight into the formation and evolution of the first stars and galaxies.
Why are aboriginals known as worlds first astronomers
Because of their knowledge of celestials like knowing every star and their movements as they shift. This plays a role is predicting seasonal events and navigational abilities.
What does the Emu in the Sky tell them
Indicates calendar and predict what was happening in the worlds around them. Emu appeared either sitting r running telling them when to hunt or steal eggs.
What does the Tagai tell them
Constellation giving signs for voyaging, turtle mating and garden preparation.
