Distance to see with the naked eye

Therefore stars the size of the sun, or even much bigger, would not be visible to the naked eye from earth. The Triangulum Spiral M33 is the third largest member of the Local Group, and some people claim to have seen it with the naked eye. As an example, we have our own Sun, where if we apply a solar filter we can see that it's true angular size is much smaller than observed with a naked eye, as discussed in this thread here. Previous Thread Next Thread. Last edited: Jun 4, The closest of these, the triple star system Alpha Centauri, is about 4. Earthrise: astronauts aboard Apollo 8 captured this spectacular photo of Earth rising above the lunar horizon as they emerged from behind the dark side of the Moon.
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How far can we see if unobstructed?

If you zoom in on them with a telescope they do not get any bigger. The farthest object visible with the naked eye is the Andromeda galaxy , located an astonishing 2. Why do I see stars when I push my eyes? Show Comments 9 Hide Comments. The smallest thing you can see depends on whether you're talking about individual objects or collections of particles. The red galaxies in the image are the remnants of galaxies after major collisions during their elderly years. Even without a telescope we can see much much further.
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optics - How far can the human eye see? Any finite distance or infinite? - Physics Stack Exchange

As an example, we have our own Sun, where if we apply a solar filter we can see that it's true angular size is much smaller than observed with a naked eye, as discussed in this thread here. Quasar 3C is an incredibly luminous object, which is brighter than individual galaxies, and powered by a huge black hole. Based on measurements of retinal absorption, the scientists calculated that a factor of 10 fewer photons were actually being absorbed by the participant's rod cells. On a clear night, you can see the Andromeda galaxy with the naked eye, which is 2. For example, at that distance, we would just be able to make out two distinct headlights on a car. I mean, what are we really looking at? The faintest galaxies are one ten-billionth the brightness of what the human eye can see.
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Recent posts What is a pangolin? The science of your skin What are genetically modified organisms GMOs? According to standard scientific doctrine, the following points are true: 1. Read more: An expanding universe and distant stars: tips on how to experience cosmology from your backyard Earth is just 4. Edition: Available editions United Kingdom.
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