Google Answers Logo
View Question
 
Q: Where is the center of the Milky Way? ( Answered 5 out of 5 stars,   0 Comments )
Question  
Subject: Where is the center of the Milky Way?
Category: Science > Astronomy
Asked by: rambler-ga
List Price: $10.00
Posted: 16 Mar 2005 17:27 PST
Expires: 15 Apr 2005 18:27 PDT
Question ID: 495880
I just saw a science program on TV in which an astronomer was using a
telescope to peer into the center of our Milky Way (she was looking
for evidence of a black hole).

I've seen pictures of galaxies on TV programs and science magazines,
and they look spectacular. However, I've never seen ANYTHING like that
with my own eyes when I look up into the night sky. (True, I've lived
almost my whole life in cities, but even on those rare occasions when
I happened to be in the countryside at night, all I've ever seen are a
LOT of stars -- but nothing that looks like a galaxy.)

So, how come this astronomer was able to see into the center of the
Milky Way (even with a telescope)? Where is it? I mean, you'd think
that we'd ALL be able to see the Milky Way's spectacular halo every
November (or whenever).

If you say that we can't see the center or even the halo because there
are clouds of dust in the way, then how could the astronomer see stars
flying around the black hole?
Answer  
Subject: Re: Where is the center of the Milky Way?
Answered By: websearcher-ga on 16 Mar 2005 17:56 PST
Rated:5 out of 5 stars
 
Hello again rambler:

Another fascinating question. :-)

Well, to start with, you are right in saying that you cannot go out at
night (even in the darkest of regions) and see the Galactic Center
with the naked eye, because a massive amount of galactic dust and gas
obscures the visible light coming from that region.

However, therein lies the key to your question of why scientists can
get such a clear view of the Galactic Center. There are *many* other
types of light and radiation coming from space than just the band
visible to the human eye.

Gene Smith's Astronomy Tutorial - The Structure of the Milky Way
URL: http://cassfos02.ucsd.edu/public/tutorial/MW.html
Quote: "What lies at the center of our Galaxy? Again, dust obscures
the visible light from us and we must use radio and infrared
observations to elicit the nuclear properties of the Galaxy."

Besides radio waves and infrared light, scientists also use X-rays and
gamma-rays to get "pictures" of what the Galactic Center is like. It
is very likely that the pictures you saw on TV were using one of these
measurement methods, which computers would then translate into a
visible representation that could be used for illustrative purposes.

Similar information can be found at other sites:

Journey to the Center of the Galaxy
URL: http://www.astro.ucla.edu/~tanner/gcintro.html
Quote: "The Galactic Center is obscured from our view by a prodigious
amount of absorbing gas and dust that lies along the 25,000 light year
(2.5X10^17 mile) distance from there to our Sun. As a result, most of
what we know about this part of our galaxy comes from observations of
radio and infrared radiation, whose long wavelengths can pass through
the dense absorbing medium and reach our telescopes on Earth."

The above UCLA website also has a good map of where the Galactic
Center is actually located in the night sky. (Scroll to the very
bottom of the page.)

"...a map so you can find the Galactic Center yourself. It is located
near the constellation Sagittarius along with a number of pretty
nebula including the Trifid Nebula (M20) and Eagle Nebula (M16). Both
of these Messier objects can be viewed nicely with binoculars.
Sagittarius, which is close to Scorpio, is visible primarily during
the summer months from April-August."

Some other interesting sites on the Galactic Center include:

A Low-Frequency Atlas of the Galactic Center
URL: http://rsd-www.nrl.navy.mil/7213/lazio/GC/

UCLA Galactic Center Group 
URL: http://www.astro.ucla.edu/~jlu/gc/

A Galactic Center Mystery
URL: http://science.nasa.gov/headlines/y2002/21feb_mwbh.htm

Search Strategy (on Google):
* center "milky way"
* "milky way" "galactic center" viewing
* "galactic center" 

I hope this helps!

websearcher
rambler-ga rated this answer:5 out of 5 stars and gave an additional tip of: $2.00
Fast, thorough explanation, and very helpful links.

Comments  
There are no comments at this time.

Important Disclaimer: Answers and comments provided on Google Answers are general information, and are not intended to substitute for informed professional medical, psychiatric, psychological, tax, legal, investment, accounting, or other professional advice. Google does not endorse, and expressly disclaims liability for any product, manufacturer, distributor, service or service provider mentioned or any opinion expressed in answers or comments. Please read carefully the Google Answers Terms of Service.

If you feel that you have found inappropriate content, please let us know by emailing us at answers-support@google.com with the question ID listed above. Thank you.
Search Google Answers for
Google Answers  


Google Home - Answers FAQ - Terms of Service - Privacy Policy