Recent Posts • Latest Topics • Unanswered Questions

We aim our radio telescope at a distant region of our Galaxy and detect 21-centimeter radio waves ...

doit_the_clown

wrote...

Go to Answer

Posts: 1408

Rep:

7 years ago

We aim our radio telescope at a distant region of our Galaxy and detect 21-centimeter radio waves ...

We aim our radio telescope at a distant region of our Galaxy and detect 21-centimeter radio waves with no Doppler shift. Each of the following is a possible explanation, except one. Which is the exception?
A)   The neutral hydrogen in this region is not moving relative to the Earth.
B)   The neutral hydrogen in this region is moving perpendicularly across our line of sight.
C)   The neutral hydrogen in this region is in a circular orbit around the galactic center at the same radius as the solar system.
D)   The neutral hydrogen in this region is moving away from us instead of toward us.

Textbook

Discovering the Universe

Edition: 7^th

Authors: Kaufmann, Comins

Read 172 times

1 Reply

Report

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein

Replies

Answer verified by a subject expert

discoverer

wrote...

Related Topics

doit_the_clown Author

wrote...

7 years ago

Helped a lot

my life

wrote...

Yesterday

This calls for a celebration Person Raising Both Hands in Celebration

apelton

wrote...

2 hours ago

This site is awesome

New Topic

Quick Reply

Explore

Post your homework questions and get free online help from our incredible volunteers

489 People Browsing

Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook

Live Chat

Related Images

5497

267

853

Your Opinion

Previous poll results: What's your favorite funny biology word?

Strange Ingredients Lurking in Doritos Chips

Bonobos, Chimpanzees, and the 98% DNA Link

Courses by Biology Forums

The Toxic Skin and Fungi Defense

It's sore throat season, why does my mucus have red spots?

Ready to ask a question on Biology Forums? Try it out

Join Our Community

Biology Forums - Study Force is a free online homework help service catered towards college and high school students. Get homework help and answers to your toughest questions in biology, chemistry, physics, mathematics, engineering, accounting, business, humanities, and more. Master your assignments quickly with thousands of step-by-step solutions to countless textbook questions asked and answered by our members. If we don't have your question, don't worry. You can ask any homework question and get expert homework help in as little as two hours.

Our extensive online study community is made up of college and high school students, teachers, professors, parents and subject enthusiasts who contribute to our vast collection of study resources: textbook solutions, study guides, practice tests, practice problems, lecture notes, equation sheets and more. With our help, your homework will never be the same!

Join for free today

How is Biology Forums - Study Force different than tutoring?

Home Search Q & A Board Gallery Resource Library Blog Dictionary Chat	Quick Links Start a Topic Latest Topics Unanswered Questions Courses Study Tools Browse by Textbook	Social Facebook YouTube Community Stats Who's Online Trending Staff	Help About Us Take the Tour Study Tips Posting Guidelines Terms and Policies Contact Us
Biology Forums - Study Force © 2010-2024 \| Powered by SMF \| SMF © 2015, Simple Machines \| Sitemap Biology-Forums.com is not affiliated with any publisher. Book covers, title and author names appear for reference only.