Why did Herschel's map of the Milky Way have flaws?

However, there were two flaws in Herschel's methodology: magnitude is not a reliable index to the distance of stars, and some of the areas that he mistook for empty space were actually dark, obscuring nebulae that blocked his view toward the center of the Milky Way.

Read more

Consequently, how does william herschel map out the shape of the milky way?

Abstract: In 1785 astronomer William Herschel mapped out the shape of the Milky Way star system using measurements he called "star-?gages." Herschel's star-?gage method is described in detail, with particular attention given to the assumptions on which the method is based. What 5 gases were in the early atmosphere? Earth's original atmosphere was rich in methane, ammonia, water vapour, and the noble gas neon, but it lacked free oxygen.

What were the three gases that made up Earth's original atmosphere quizlet?

Theories suggest its atmosphere was similar to the gases released from volcanoes. This means there was little to no oxygen, and the atmosphere was made up primarily of carbon dioxide, water vapor, and nitrogen. There may have also been small amounts of carbon monoxide, hydrogen sulfide, and hydrogen cyanide. Which of the following process brought changes in the early atmosphere? Photosynthesis contributed oxygen to Earth's early atmosphere and helped change it from one rich in carbon dioxide to one rich in oxygen.

One may also ask how was the early atmosphere formed?

(4.6 billion years ago. As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today's atmosphere. After about half a billion years, Earth's surface cooled and solidified enough for water to collect on it.