Many man made objects are visible from space. Large airports and large dams are common. The Great Wall of China cannot even be seen from a fairly low orbit around the Earth. Despite looking carefully for it, the astronauts are unable to distinguish it from the landscape as it blends in too well with the area around it.
Sedna is the most distant solar system object discovered so far. It is about three times farther away than Pluto currently is. Because it is so far away, scientists are not sure if it has enough mass to be classified as a dwarf planet.
a mirage
The bending of light from distant galaxies is primarily caused by gravitational lensing, a phenomenon predicted by Einstein's theory of general relativity. When light from a distant galaxy passes near a massive object, such as another galaxy or a cluster of galaxies, the gravitational field of that object warps the space around it, causing the light to follow a curved path. This bending can magnify and distort the appearance of the distant galaxy, allowing astronomers to study objects that would otherwise be too faint or obscured.
You have two eyes, away from each by about 6 cm. The object placed nearby makes a larger angle to both eyes as compared to distant object. From that angle, you make out the distance of the object from you. Stars are too far away for human eyes (or any animal eyes, for that purpose.) to make smaller or bigger angle. They all make the smallest possible angle witch can be recognized by naked eyes and so you can not differentiate between near or distant star. All of them are distant objects for human eyes.
It was the first artificial (manmade) object to be placed in orbit around the earth. It started the space race between the USA and the USSR.
Titanic
One example of an object that does not share orbital space with another object is an exoplanet that has just been discovered in a distant solar system. Since it is the only known object in its orbit, it does not share its orbital space with any other celestial body.
When focusing on a distant object, the lens is more convex. The convex lens bends light inward and converges it at a focal point to form a sharp image of a distant object.
[object Object]
[object Object]
Sedna is the most distant solar system object discovered so far. It is about three times farther away than Pluto currently is. Because it is so far away, scientists are not sure if it has enough mass to be classified as a dwarf planet.
When the ciliary muscles view a distant object, they relax. This causes the suspensory ligaments to pull tight, which flattens the lens of the eye. As a result, the eye is able to focus on the distant object by decreasing its refractive power.
it is the most distant object object known
It is known as a mirage.
uranus
When you see a distant object, your focal distance increases. This means that your eyes adjust in order to focus on the object that is far away, by lengthening the shape of the lens to bring the object into focus.
When looking at a distant object, the ciliary muscles in the eye relax, causing the lens to flatten. This allows the light rays from the distant object to focus directly on the retina at the back of the eye, creating a clear image.