Typical stellar distances of visible stars in the Milky Way

AI Thread Summary
Most visible stars in the night sky are located within a few dozen to 1,000 light years from Earth, with many bright stars like Betelgeuse and Polaris being significantly farther at 550 and 300 light years, respectively. The nearest star, Alpha Centauri, is just 4 light years away, yet appears bright despite being similar in brightness to the Sun. The visibility of stars is influenced by their brightness and the presence of interstellar dust, which can obscure light. While individual stars are mostly within 1,000 light years, collections of stars, such as those in the Andromeda galaxy, can be seen from much greater distances. Overall, the average visibility of sun-like stars is limited to about 20 light years.
Holocene
Messages
237
Reaction score
0
How far away is the average star in the night sky?

I mean, can we see stars that are on the other side of the galaxy?

Perhaps most of the visible stars are maybe just a few dozen light years away?
 
Astronomy news on Phys.org
Most are within about 100light years ( the milky way is 100,000 light years across)
The sample of visible stars is obviously biased by very bright stars. Betelgeuse is a particulalrly bright red giant, it is one of the brightest stars in the sky but is at a distance of 550 lyr, Polaris is also a very bright star at around 300lyr,
The nearest star is Alpha Centauri is only 4lyr and is only about the same brightness as the sun but appears as a bright star.
 
Virtually all individual stars visible to the naked eye are within 1000 light years of earth. We can, however, see collections of stars [like the Andromeda galaxy] at much greater distances.
 
Assuming we can see stars down to a limiting brightness of 6th magnitude, in the absence of interstellar dust which blocks out the light, an F-type supergiant would be visible out to about 4000 parsecs - over 10,000 light years. An "average" sun-like star is only visible to about 20 light years away though!
 
Is a homemade radio telescope realistic? There seems to be a confluence of multiple technologies that makes the situation better than when I was a wee lad: software-defined radio (SDR), the easy availability of satellite dishes, surveillance drives, and fast CPUs. Let's take a step back - it is trivial to see the sun in radio. An old analog TV, a set of "rabbit ears" antenna, and you're good to go. Point the antenna at the sun (i.e. the ears are perpendicular to it) and there is...
3I/ATLAS, also known as C/2025 N1 (ATLAS) and formerly designated as A11pl3Z, is an iinterstellar comet. It was discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) station at Río Hurtado, Chile on 1 July 2025. Note: it was mentioned (as A11pl3Z) by DaveE in a new member's introductory thread. https://www.physicsforums.com/threads/brian-cox-lead-me-here.1081670/post-7274146 https://earthsky.org/space/new-interstellar-object-candidate-heading-toward-the-sun-a11pl3z/ One...
Back
Top