4 marks the diagram below shows the positions of the

Info icon This preview shows page 10. Sign up to view the full content.

View Full Document Right Arrow Icon
4. [4 marks] The diagram below shows the positions of the Milky Way and four other galaxies spaced at intervals of 10 billion light years. The distances are expressed relative to the position of the Milky Way. For simplicity, assume that the universe is 14 billion years old, that all galaxies formed at the instant the universe began, and that the universe is not expanding (i.e. that these galaxies have remained in the positions where they formed). (a) For each of these galaxies, fill in the information requested in the table below. Current Distance 40 billion ly 30 billion ly 20 billion ly 10 billion ly Milky Way Current actual age Current apparent age to observer in Milky Way Age of the universe when this galaxy emitted the light now being seen in the Milky Way (b) On the diagram, draw and label a point on the dotted line indicating the edge of the observable universe for an observer in the Milky Way. (c) On the diagram, draw and label a point on the dotted line indicating the edge of the observable universe for an observer in the galaxy lying 40 billion light years from the Milky Way. THE END AST 201 MIDTERM 1, FALL 2012 PAGE 10 OF 10 Milky Way 10 billion ly 20 billion ly 30 billion ly 40 billion ly
Image of page 10
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern