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- The system is defined so that magnitude 6 stars are just visible to the unaided eye. Stars invisible to the eye but visible in the telescope have magnitudes larger than 6, with the darkest nearby stars having magnitudes as large as 16.
astrophysicsspectator.org/topics/observation/MagnitudesAndColors.html
Feb 8, 2023 · If a star is 100 light years away, we are seeing it as it was 100 years ago, etc. If a star dies (goes nova), we won't know about it for the year-equivalent of its distance in light-years. Then, one day, we'll see a flash in the sky and we'll know that if it is 27 light-years away, the star died 27 years ago. Share.
- Olbers Paradox Solution
Light from a star is attenuated by distance. It is possible...
- Olbers Paradox Solution
The system is defined so that magnitude 6 stars are just visible to the unaided eye. Stars invisible to the eye but visible in the telescope have magnitudes larger than 6, with the darkest nearby stars having magnitudes as large as 16.
The apparent magnitude, m, of a star is the magnitude it has as seen by an observer on Earth. A very bright object, such as the Sun or the Moon can have a negative apparent magnitude.
Jul 19, 2024 · By knowing a celestial object’s brightness, you can tell if this object is visible or not. But how do you actually measure this brightness? Which measurement is used in what case? Let’s sort it all out so you can observe the night sky like a pro! P.S. To quickly find out the brightness of any object in the sky, get the Sky Tonight app. Contents.
Planets are just clumps of stuff (like the Earth) and give off no visible light, except whatever happens to bounce off them from a nearby star. Stars are extremely hot and therefore glow, like fire or an incandescent light bulb.
Apparent magnitude (m) is a measure of the brightness of a star, astronomical object or other celestial objects like artificial satellites. Its value depends on its intrinsic luminosity, its distance, and any extinction of the object's light caused by interstellar dust along the line of sight to the observer.
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Astronomers use two different definitions of magnitude: apparent magnitude and absolute magnitude. The apparent magnitude (m) is the brightness of an object and depends on an object's intrinsic luminosity, its distance, and the extinction reducing its brightness.
