Skip navigation and go straight to page content.
National Aeronautics and Space Administration
Goddard Space Flight Center
Home
Science
Astronomer's Toolbox
Cosmic Objects
Big Questions
Featured Science
Observatories
Learning Centers
Satellite Showcase
How Scientists Get Data
Detection Technology
History of High Energy Observatories
Special Exhibits
Coloring Pages
Scientist Profiles
You Be the Astrophysicist
Cosmic Distance Scale
Educators
Lesson Plans
Materials
Programs
Ask An Astrophysicist
Resources
Other Resources
Dictionary
Search
Hubble's Law Quiz
Traveling in your starship, you observe a distant galaxy that is 870 million light years away and is moving away from you at a speed of 20,000 km/sec. How fast would you have to travel in order to be able one day to catch up to a galaxy twice as far away?
at least 5,000 km/sec.
at least 10,000 km/sec.
at least 20,000 km/sec.
at least 40,000 km/sec.
at least 100,000 km/sec.
You observe three distant galaxies and note their apparent radial velocities:
BFG-01 39,300 km/s
BFG-02 79,000 km/s
BFG-03 19,000 km/s
Which of the following is true about these galaxies?
BFG-02 is twice as big as BFG-01.
BFG-03 is the most massive galaxy.
BFG-02 is the least massive galaxy.
All of the Above.
None of the Above.
Home
Science
Astronomer's Toolbox
Cosmic Objects
Big Questions
Featured Science
Observatories
Learning Centers
Satellite Showcase
How Scientists Get Data
Detection Technology
History of High Energy Observatories
Special Exhibits
Coloring Pages
Scientist Profiles
You Be the Astrophysicist
Cosmic Distance Scale
Educators
Lesson Plans
Materials
Programs
Ask An Astrophysicist
Resources
Other Resources
Dictionary
Search
