Isp 205 - Study guides, Class notes & Summaries

Rank the following 4 items by how long it takes for light to reach us from these object, from shortest to longest. The Andromeda Galaxy the center of the Milky Way Pluto Sun. Ans- Sun, Pluto, center of the Milky Way, the Andromeda Galaxy. The current best estimate for the age of the universe is about Ans- 14 billion years. What do astronomers mean when they say the universe is expanding? Ans- Average distances are increasing between most galaxies. Which statement is false? 1. A co...

ISP 205 CHAPTER 4 TEST ...

Which two factors primarily determine the characteristics of a star? Ans- its mass and its stage of life Star A is identical to Star B, except that Star A is twice as far from us as Star B. Therefore... Ans- both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A Which of the following statements about spectral types of stars is not generally true? Ans- The spectral type of a star can be used to determine its distance. Sirius is a star ...

Explain why we see objects at great distances as they were in the distant past Ans- -The universe is constantly expanding -an observer in any galaxy sees more distant galaxies moving away faster -Distances and speeds help determine the universe is expanding Summarize the major cosmic events that prepared the way for life on Earth Ans- -Big Bang created matter -Gravity pulled that matter together to form galaxies -Galaxies created stars alongside nuclear fusion -Stars created elements nec...

ISP 205 EXAM 3 WITH QUESTIONS AND ANSWERS...

How does the hypothesis of inflation account for the existence of the "seeds" of density from which galaxies and other large structures formed? Ans- Inflation would have caused random, microscopic quantum fluctuations to grow so large in size that they became the seeds of structure. Why do virtually all the galaxies in the universe appear to be moving away from our own? Ans- Expansion causes all galaxies to move away from nearly all others. Suppose we observe a Cepheid variable in a ...

ISP 205 EXAM 1 ...

Cosmic Address, from small to large Ans- Earth, solar system, Milky Way Galaxy, Local Group, Local Supercluster, universe The Universe is expanding means that... Ans- The average distance between galaxies is growing with time If stars existed but galaxies did not... Ans- We would not exist because we are made of material that required recycling in galaxies. Could we see a galaxy 20 billion light years away? Ans- No, because it would be beyond the bounds of our observable universe The...