It is 9 times brighter, so therefor 9 squared or 9 x 9=81 times as bright.
(90/10)2= 81 times as bright,
a light that is half as far away as anouther light is 4 times brighter than the other light
Refraction. At sunset/sunrise the sunlight passes through a lot of the atmosphere to get to the observer. All that air acts as a prism, bending the light, and blue light bends easier than red light. This means the blue light is bent more, and away from the observer, leaving only the red light behind.
69000 light years
1.red 2.blue 3.green and yellow-because it is reflected by the leaf which is green or yellow
-- The nearest one is about 93 million miles away. That's the one called the "Sun". -- The next nearest one is in the constellation Centaurus. It's about 4.2 light years away. That's about 24,691,000,000,000 miles. -- The farthest ones that can be detected by today's best astronomical equipment are about 14 billion light years away. That would be around 82,302,000,000,000,000,000,000 miles.
Sunlight entering the atmosphere is "white" light, containing all the colors in the spectrum. Dust in the air tends to scatter the blue components of the sunlight making the sky appear blue.However, when we look towards the sun at sunset, we see red and orange colors because the blue light has been scattered out and away from the line of sight. The more dust there is in the air the more marked is this effect.
It is 9 times brighter, so therefor 9 squared or 9 x 9=81 times as bright.
4 times as bright. This is calculated as 1/22.
Farther away!
they are a cave dwelling species of fish and shy away from bright light they are a cave dwelling species of fish and shy away from bright light
How bright a star appears depends on both its actual brightness and how far away it is. The farther away a star is, the dimmer it appears. A bright but very distant star many therefore appear dimmer than a less bright star that is closer to us.
Other things being equal, the farther away an object is, the dimmer (less bright) it will appear. If no light is lost (due to gas or dust in the line of sight), there is an inverse-square law - for example, an object that is 10 times closer to another one, both of which have the same real brightness, will look 100 times brighter to us.
Due to the inverse square law, stars that are far away from Earth are generally dimmer than stars that are close to Earth. However, there are many exceptions, since stars can also appear brighter or dimmer depending on their luminosity.
How bright a star appears depends on how bright it is and how far away it is. While, on the whole Polaris is a very bright star it is also very far away, at least 350 light years, which makes it appear dimmer. The brightest star in the night sky is Sirius, one of the closest stars to Earth at only 8.6 light years. The brightest star overall, as viewed from Earth, is the sun, which is a quarter of a million times closer to us than the next nearest star.
Stars are incredibly bright objects. Many of them are in actuality as bright as if not brighter than the sun, but appear as mere points of light due to their distance.
Other things being equal, the farther away an object is, the dimmer (less bright) it will appear. If no light is lost (due to gas or dust in the line of sight), there is an inverse-square law - for example, an object that is 10 times closer to another one, both of which have the same real brightness, will look 100 times brighter to us.
The other stars do not appear as bright as the sun because they are much farther away. Even the closest stars apart from the sun are hundreds of thousands of times farther away. In terms of actual brightness, some stars are brighter than the sun.
The stars vary in both how far away they are and in actual brightness. The closer a star is to us, the brighter it will appear. Stars also vary in actual brightness. For example, the brightest star in the night sky is Sirius. It appears bright because it is both a fairly bright star (about 25 times brighter than the sun) and is one of the closest stars to us at 8.6 light years away. The nearest star visible in the night sky, Alpha Centauri, is about half that distance but does not appear as bright because it is far less bright than Sirius in actual luminosity. Conversely, Sirius also appears brighter than Betelgeuse which is actually much brighter than Sirius but also much farther away.