Why did Kapteyn and Shapley models miss to give proper estimates of the size of the Milky Way?

Absorption by Interstellar Dust affects all attempts to map the Milky Way: Shapley & Kapteyn thought it was smaller than it actually is, and so overestimated the size of the Milky Way. Robert Trumpler (1930) showed that interstellar dust absorption was significant.

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How did astronomer William Herschel conclude incorrectly that our Sun was in the middle of the galaxy?

William Herschel's Heliocentrism Herschel was the first to propose a model of the galaxy based on observation and measurement. He concluded that it was in the shape of a disk, but incorrectly assumed that the sun was in the center of the disk. And another question, why did the herschels in the late 1700s and indeed all astronomers up to about 1930 get the wrong size and shape of the milky way from counting stars? Therefore, extinguishing of light by material between the stars is more important than either Herschel or Kapteyn were aware, and it is this effect that caused them both to get incorrect results for the size and shape of the Milky Way.

Is black hole discovered?

After decades of black holes being known only as theoretical objects, the first physical black hole ever discovered was spotted in 1971. Then, in 2019 the Event Horizon Telescope (EHT) collaboration released the first image ever recorded of a black hole. People also ask where is earth in the milky way galaxy? Earth is located in one of the spiral arms of the Milky Way (called the Orion Arm) which lies about two-thirds of the way out from the center of the Galaxy. Here we are part of the Solar System - a group of eight planets, as well as numerous comets and asteroids and dwarf planets which orbit the Sun.

Which arm of the galaxy are we?

In recent decades, research advances have revealed that we live in our very own spiral arm of the galaxy, albeit a relatively minor one. Our spiral arm is the Orion-Cygnus Arm, or simply, the Orion Arm or Local Arm. You sometimes still hear the names Orion Bridge or Orion Spur. Accordingly, how many suns are in the universe? Is there only 1 sun in the universe? Explanation: There are billions of stars larger or smaller than SUn in the Galaxy..But we call them stars only.. So we have only one Sun.