National Aeronautics and Space Administration
Goddard Space Flight Center
Imagine the Universe!
Home
Science
Astronomer's Toolbox
Cosmic Objects
Big Questions
Featured Science
Observatories
Special Exhibits
Scientist Profiles
You Be the Astrophysicist
The Cosmic Distance Scale
Educators' Corner
Lesson Plans
Materials
Programs
Ask an Astrophysicist
Resources
Other Resources
Dictionary
Search
Astronomer's Toolbox
Gamma Telescopes Quiz - Level 1
Gamma Telescopes Quiz
Gamma-rays cannot be easily focused because
[A] they do not originate from one point
[B] it is too hard to bend the path of a gamma-ray without changing its energy
[C] they can only be observed in space
[D] it would cost too much to focus gamma-rays
Astronomers want to focus gamma-rays because
[A] they need to be able to increase the effective "signal" from cosmic sources
[B] they want to be able to create a 2-dimensional image of the gamma-ray sky
[C] the results will allow them to do better science
[D] all of the above
