How many stars are there in our Galaxy (Milky Way)?
I am confused about the number of stars in our Milky Way galaxy. Some sources say that the Milky Way consists of 100 billion stars. Other say that the MASS of our galaxy is roughly 100 billion times the mass of the Sun. So because most of the galaxy mass is in the interstellar gaseous and dust nebulae there must be less than a 100 billion stars in it or the total mass must be greater. Which of these is correct? And did someone estimate the number of ACTUAL stars in our Galaxy?
Most of the mass in the galaxy is NOT in interstellar gaseous and dust nebulae. Most of the luminous matter is in stars and not nebulae. Now, the mass of the galaxy is mostly dominated by dark matter, which is something that is not detected by any telescope, or anything except through its gravity. But as far as the luminous matter goes, most of it is stars.
About the number of stars: People have studied the mass distribution of stars in the galaxy. Further, one also knows the amount of light put out by each type of star. So, by measuring the total amount of light in the galaxy (called luminosity), and knowing the mass, one can estimate the number of stars that are there in the galaxy. So, even though we cannot actually count the number of stars in the galaxy, we can estimate the number of stars in the galaxy as roughly 100 billion (100,000,000,000). It turns out that there are many more stars with mass less than the mass of the Sun than with mass more than the mass of the Sun. So, it all works out right.
Get More 'Curious?' with Our New PODCAST:
- Podcast? Subscribe? Tell me about the Ask an Astronomer Podcast
- Subscribe to our Podcast | Listen to our current Episode
- Cool! But I can't now. Send me a quick reminder now for later.
- How many stars can I see?
- Is it possible to count the stars?
- How many known galaxies are there?
- How many stars are born and die each day?
How to ask a question:
If you have a follow-up question concerning the above subject, submit it here. If you have a question about another area of astronomy, find the topic you're interested in from the archive on our site menu, or go here for help.
This page has been accessed 346835 times since April 29, 2002.
Last modified: January 16, 2006 1:43:40 PM
Ask an Astronomer is hosted by the Astronomy Department at Cornell University and is produced with PHP and MySQL.
Warning: Your browser is misbehaving! This page might look ugly. (Details)