- #1
P-Jay1
- 32
- 0
If I know the diameter of a galaxy in the sky is 150 arcseconds,
how do I find the angular diameter?
how do I find the angular diameter?
phyzguy said:150 arcseconds is the angular diameter.
The angular diameter of a galaxy is a measure of the size of the galaxy as seen from Earth, expressed in degrees. It is the angle between two imaginary lines drawn from the observer to opposite points on the galaxy's edge.
The angular diameter of a galaxy is typically calculated using the small angle formula, which takes into account the distance to the galaxy and its physical diameter. This formula is θ = d/D, where θ is the angular diameter, d is the physical diameter of the galaxy, and D is the distance to the galaxy.
The angular diameter of a galaxy is important because it provides information about the size and scale of the galaxy. It can also help astronomers determine the distance to the galaxy and its place in the universe.
The angular diameter of a galaxy can greatly affect its appearance. A larger angular diameter means the galaxy will appear larger and more spread out in the sky, while a smaller angular diameter will make the galaxy appear smaller and more compact.
Yes, the angular diameter of a galaxy can change over time. This can be due to a variety of factors, such as the expansion of the universe or the movement of the galaxy itself. However, these changes are often very small and can only be measured over long periods of time.