Concept explainers
Ranking the following in the order from easiest to most difficult to explain in terms of current ideas about galaxies’ formation and evolution through discussion involving scribing, advocating, skepticism and moderation
(a) an extremely large elliptical galaxy with a lookback time of 13 billion years,
(b) a small irregular galaxy at a distance of 10 million light-years from Earth,
(c) a large spiral galaxy, 20 million light-years from Earth, consisting entirely of stars made only of hydrogen and helium,
(d) a small spiral galaxy, 5 million light-years from Earth, with one of the most massive black holes ever discovered at its center,
(e) a spiral galaxy approximately the size of the Milky Way with a lookback time of 13 billion years.
Want to see the full answer?
Check out a sample textbook solutionChapter 21 Solutions
The Cosmic Perspective (8th Edition)
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON