They dont
By their gravitational effects.
No. There are almost no astronomers that think Pluto is a planet. They know it's officially a dwarf planet.
Astronomers don't know yet.They are still trying to find out.May be you may one day be an astronomer yourself then you can fine that out.By Asampana Stephen.
Knowing the absolute magnitude of stars is crucial because it allows astronomers to determine their intrinsic brightness, independent of their distance from Earth. This helps in comparing the true luminosities of different stars and understanding their evolutionary stages. Additionally, absolute magnitude is essential for calculating distances to stars using methods like the distance modulus, which enhances our understanding of the structure and scale of the universe.
i know astronomers use paralax for stars thay know by red shift if ther moveing away and blue shift if coming closer may some galaxies are so far there lite wont reach us
They can be seen in telescopes and instruments can measure their light, etc.
so that they know the distance of the planets
The baseline distance is one astronomical unit, the average radius of the Earth's orbit. Measurements of a star's position against the background of distant stars are made at intervals of 6 months, when the Earth is at two different places, to measure the parallax and hence the distance to individual stars. For a parallax of 1 arc-second the distance is 1 parsec, equal to a distance of 3.26 light-years. In astronomical data, stars' distances are quoted in parsecs. In the 19th century Bessel was the first astronomer to measure parallax and so discover that the stars are at distances that are much larger than was thought possible before then. Even the closest stars have a parallax of under 1 second of arc, and until the 19th century the apparent absence of parallax in stars was taken as a major proof that the Earth cannot be in motion round the Sun, and this was quoted by Galileo (among many others) before he adopted the Copernican heliocentric system later.
to see stars and planets and other stuff in space... IDK im guessing, someone answer, i needa know plzzz
It's used to determine the magnetic field strength of stars. That's not really a "why", though. I suppose the "why" would be "because they want to know the magnetic field strength of stars".
The celestial sphere is a useful tool for simplifying the complex three-dimensional nature of space into a two-dimensional representation for observational purposes. While stars are not all at the same distance, treating them as points on the celestial sphere helps astronomers easily locate objects in the sky and track their positions over time. It provides a convenient reference system for celestial coordinates and navigation.
It was like religion. Why do Christians put so much on faith?