Texttask7

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School

Ramapo College Of New Jersey *

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MISC

Subject

Astronomy

Date

Oct 30, 2023

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docx

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Uploaded by MasterTarsierPerson980

Text task 7. The following 10 questions will be on the Final 300-305 1. Name the three types of galaxies. Which make up 25% of the nearby universe? elliptica, spiral, and irregular galaxies. spiral galaxies make up 25% of the nearby universe 2. What is thought to be the cause of the spiral arms? a zone that rotates slower than the galaxy causes the arms to rise. it is called a density wave 3. What is the difference between elliptical and irregular galaxies regarding star age and formation? elliptical galaxies have old stars that do not do much and there are hardly any signs of star forming dust and gas. irregular galaxies have dust, gas, and hot blue stars. lots of star formation 40-43 4. Einstein created special relativity to better understand the mechanics of the universe. Briefly explain his 2 principles. Einstein introduced the principles of special and general relativity. these then introduced a new way of thinking about mass, energy, gravity, space, time etc 5. E=mxc2, what does it translate into and what was it first applied to? it translates into energy= mass x the speed of light squared. this was introduced when Einstein realized that mass and energy have an equivalence. 6. The 4 th dimension is used to describe the combination of ____galaxies ________ 7. What force plays the biggest role in Einstein’s theory of General Relativity?

gravity 58-59 8. What are the four possible ends to the universe, please give a one sentence explanation of each. dark energy is a gravity opposing force which could result in a flat universe. The geometry of space could cause the universe to form into various geometries that all come with different fates, but it depends on the mass-energy density. big crunch and big chill is the over expansion of the universe which could cause it to end in a cold, lengthy way. a cold death is in the case there is a big chill, the death of the universe will take a long time. 9. Describe what dark energy does. dark energy is a gravity- opposing force that results in matter flying apart 10. What are the three geometry’s of the universe? flat, closed, and open

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