Can we expect stars to become visible only in infrared after a while?

[SpaceBear]

I wonder if some old stars will become invisible to our eyes after a while because of the redshift?
Since they get further away from earth, maybe we won't receive their radiation in visible light any more?
I'm talking about stars that are not obscured by any other objects or dust, which you don't have to detect them in infrared (IR).
If the answer is yes, then how long will it take for a star to be obscured to us because of the redshift? Say a star that is 5 billion years from us and getting further away each day.

thanks

 

[phinds]

I wonder if some old stars will become invisible to our eyes after a while because of the redshift?
Since they get further away from earth, maybe we won't receive their radiation in visible light any more?
I'm talking about stars that are not obscured by any other objects, where you don't have to detect them in infrared (IR).
If the answer is yes, then how long will it take for a star to be obscured to us because of the redshift? Say a star that is 5 billion years from us and getting further away each day.

thanks

Stars are contained in galaxies. All of the galaxies in the universe, except those in the local cluster of galaxies, are moving away from us and eventually will be outside of the Earth's observable universe and yes they will redshift as they go. This will take a LONG time. Those currently at the edge of the observable universe are already significantly redshifted.

 

[SpaceBear]

This will take a LONG time.

How long?
I mean, in the order of magnitude.
tens of billions of years or maybe millions of billions of years?

When can we expect to see the fist galaxy that completely redshifted in infrared?

 

[Mordred]

Considering the observable universe is 47 billion years in radius and we can see objects at extreme redshift I would say that describes your order of magnitude. in 10's of billions.

The cosmic microwave background has a redshift of z=1089, corresponding to an age of approximately 379,000 years after the Big Bang and a comoving distance of more than 46 billion light years

http://en.wikipedia.org/wiki/Redshift

in a section on this page it will describe various objects as the earliest detected such as the highest redhift to a galaxy

 

[pmacias]

for your question. The answer is, it depends on the specific star and its distance from Earth. As stars age and evolve, they can change in temperature and emit different wavelengths of light. This means that some stars may eventually only emit in the infrared spectrum, while others may still be visible in visible light. Additionally, the redshift phenomenon is caused by the expansion of the universe, which means that the further away a star is, the more its light will be shifted towards longer wavelengths, including infrared. However, this doesn't necessarily mean that a star will become completely invisible to us. It may just appear fainter or harder to detect.

As for the time it takes for a star to become obscured to us due to redshift, it again depends on the specific star and its distance from Earth. Generally, the further away a star is, the longer it will take for its light to be significantly redshifted. For a star that is 5 billion years from us and getting further away each day, it may take millions or even billions of years for its light to become predominantly infrared. But again, this is just a general estimate and would vary depending on the star's exact distance and other factors.

Overall, the visibility of stars in different wavelengths and the effects of redshift are complex and dependent on various factors. It's important for scientists to continue studying and monitoring stars to better understand their evolution and behavior.