Weeks 5, 6: How is Olber's paradox solved? Does the Universe have a center or an edge? What is th...
JUST CHOOSE ABCD QUESTION 6 When was most of the Helium in the Universe formed? A. Throughout the history of the Universe, by nuclear fusion in stars B. A few minutes after the Big Bang C. At the time of Recombination D. At the time of the Big Bang 10 points QUESTION 7 Based on current estimates of the value of Hubble?s constant, how old is the universe? A. more than 100 billion years old B. between 5 and...
How and why does the CMBR, redshifts of distant galaxies, and relative abundances of the elements support a beginning to our universe? About 380,000 years after the big bang, the universe became transparent to light. What had to occur for this to happen and what remnant is left behind that we can see today? Go to Planck and The Cosmic Microwave Background and answer the following: How accurate is the the Planck data? What do the different colors help us...
Homework questions 1) Why did astronomers expect to find that the universe was decelerating? What is it actually doing? 2) What is meant by the "critical density of the universe? How is it related to the different models of the universe? 3) How was the interactions of particles different when the universe was a hundredth of a second old, 3 minutes old, and 500,000 years old? 4) Why don't we know what the universe was like at its actual birth...
9/ the 2011 Nobel Prize in Physics was awarded to 3 men who study white dwarf supernova explosions, which are known as Type la supernovae. The following problem is designed to give you a feel for what they did, and the sorts of apparent brightnesses and distances they were working with. A typical Type la supernova explosion has a luminosity of 1.72 x 10^36 W. If we observe such a supernova to have an apparent brightness of 1.25 x 10^-17...