Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Classical Physics
Quantum Physics
Quantum Interpretations
Special and General Relativity
Atomic and Condensed Matter
Nuclear and Particle Physics
Beyond the Standard Model
Cosmology
Astronomy and Astrophysics
Other Physics Topics
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Classical Physics
Quantum Physics
Quantum Interpretations
Special and General Relativity
Atomic and Condensed Matter
Nuclear and Particle Physics
Beyond the Standard Model
Cosmology
Astronomy and Astrophysics
Other Physics Topics
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Astronomy and Cosmology
Astronomy and Astrophysics
Are the stars that we see in constellations within the Milky Way galaxy?
Reply to thread
Message
[QUOTE="snorkack, post: 6841671, member: 436348"] The biggest stars are R Doradus and Betelgeuse, around 5 centiseconds across. Which means about 1 in 4 millions. At the 280 Mpc distance of BL Lac, this makes around 70 pc. Is the galaxy really that small? But an example about ambiguity of what you see is the Sword of Orion. The brightest components are: θ[SUP]1[/SUP] C is +5,13 θ[SUP]1[/SUP] A and D are +6,7, B +7,9, all of them within half a minute of C. (Other stars are below +10) θ[SUP]2[/SUP] A is +5,02 θ[SUP]2[/SUP] B is +6,4 and C +8,2. And those are slightly more separated than the θ[SUP]1[/SUP] components. θ[SUP]2[/SUP] A and θ[SUP]1[/SUP] C are bright enough that you might see them as single stars, and θ[SUP]2[/SUP] A is the slightly brighter of these. But since θ[SUP]1[/SUP] C has more companions with tighter separations, these sum up to a brighter visible spot. So what do you really see? A cluster, or the brightest star of the cluster? [/QUOTE]
Insert quotes…
Post reply
Forums
Astronomy and Cosmology
Astronomy and Astrophysics
Are the stars that we see in constellations within the Milky Way galaxy?
Back
Top