There are probably more than 170 billion galaxies in the observable universe.
There are a lot of galaxies known in the universe. The number is uncertain. Scientists have found over 100,000 galaxies as they create their 3-D map of the universe. Though, there is an estimates 200 billion galaxies in existence.
No one is really sure exactly how many there are. Many millions probably. One thing that might be useful in answering this is a 2 year survey (the 2dF Galaxy Survey) which has just finished. So far they have surveyed 100, 000 galaxies to make a 3-D map of the universe, but their goal is 250,000! And that's certainly not all of them that are out there.
I've seen it stated in astronomy textbooks that there are roughly 2,500 stars
with visual magnitudes of 6 or brighter. Mag-6 is usually considered to be the
limit of naked eye visibiity. How many of those are in your sky at any given
time depends on the time of night, where you live, the shape of horizon clutter,
and the extent of pollution due to light and particulate matter in your area. But
regarding the stars alone, since you see 1/2 of the sky at any time, you can
take 1,200 as a broad ballpark average in answer to your question.
It is stated that the number of galaxies are in the billions but the ones that have been counted and named are much less. According to the NASA database there are about 4 million names that have been given to galaxies and as the quality of telescopes improve more will be added to the database.
It isn't possible to put an exact number to it, because it all depends on the amount of light pollution, other pollutants and the state of your eyes.
An average person will be a able to see about 2,000 stars, the top limit around 5,000.
In general terms, with people of normal vision, there are in total around 8,000 stars observable with the naked eye. This breaks down to 4,000 in the north, and 4,000 in the south, non-overlapping. But in the north, for example, half the stars in your year-round sky are obscured by the sun; so roughly 2,000 stars are visible, on average, in the nighttime sky on any night. And this assumes very good viewing conditions. This may not sound like a very high number, but we have become used to hearing astronomical things described with correspondingly huge numbers. Try coming up with a method of estimating the number of stars you actually see; you probably won't be too far off from 2,000 if you do it carefully. We are talking about stars in the Milky Way; a small number of galaxies and clusters can be seen as 'stars' with the naked eye, but no stars outside of the Milky Way are observable..
There is no way to find out how many galaxies are documented, but according to the NASA Extragalactic database, there are 4 million named. It is estimated that there are hundreds of billions of galaxies in space.
About 6000, under very good viewing conditions. Of these, about half (3000 stars) are above the horizon at any one moment. Since there is a lot of extinction (reduction in brightness) for stars near the horizon, the actual number you can see is somewhat less, even under the best viewing condition.
The present estimate is "billions".
Combine that with billions of stars in each galaxy, and before
you know it, you could be talking some big numbers.
We don't know for sure, but astronomers have so far found about 10,000.
To be precise, you can't see it with the naked eye. You can see it well, in a small telescope. Neptue is too far away, both from the Sun and from the Earth, to be seen with the unaided eye.
You can see at least three galaxies - the Andromeda Galaxy, and the two Magellanic Clouds - with the unaided eye.
Mercury, Venus, mars, Jupiter and Saturn can all be seen fairly easily, appearing as bright stars. If you have very clear skies, very good eyes and know exactly where to look it is possible to just see Uranus. All of the planets have to be in the right place relative to earth to see them - no good if they are behind or in front of the sun.
The planets have constant effects on human lives despite the inability to see the majority by human eye. The planets alter weather, gravity, daylight, and many other aspects.
To a close approximation, none of them are visible to the unaided eye. With our bare eyes, we can see only a few thousand of the brightest ones. That's something like 0.0000025 percent of the stars in our own galaxy, and no individual stars in any other galaxy.
Mercury Venus Earth Mars Jupiter Saturn ------------- Six of them.
All the stars we see with the unaided eye are part of the Milky Way. Many of the brighter ones have names.All the stars we see with the unaided eye are part of the Milky Way. Many of the brighter ones have names.All the stars we see with the unaided eye are part of the Milky Way. Many of the brighter ones have names.All the stars we see with the unaided eye are part of the Milky Way. Many of the brighter ones have names.
yes
Yes, you can with the unaided eye.
Objects large enough and close enough to see with the unaided eye are referred to as macroscopic, which is the opposite of microscopic.
Objects large enough and close enough to see with the unaided eye are referred to as macroscopic, which is the opposite of microscopic.
using your unaided eye compare the image of the letter
people
Andromeda gallexcy
yesyes
Yes, Saturn is often easy to see.
It make it possible to see things that are too small to see with the naked, unaided eye.