Chemical composition of the Sun and the movement of galaxies.
Astronomers are scientists who study the universe and the objects within it such as the sun, galaxies, stars, planets, star forming regions, and the evolution of the universe. Chemical composition of the Sun and the movement of galaxies are the types of evidence that astronomers use to estimate the age of the universe and stars. Astronomers detect the movement of galaxies by viewing its light spectrum. Astronomers can measure the expansion rate of the universe accurately by taking the measurements of many galaxies. Also, the chemical composition of the sun gives astronomers some idea about the age of the universe and stars.
Answer:
include the movement of galaxies and the chemical composition of the sun.
Explanation:
To estimate the age of the universe and stars, astronomers observe and evaluate the movement of galaxies and the composition of the sun.
Galaxies are formed by clusters of various celestial bodies, mainly planets, stars, cosmic dust and other astronomical elements that are in a common center. The force of gravity is mainly responsible for the union of the components of a given galaxy.
The Sun, in turn, is composed mainly of the elements hydrogen and helium, but it also has other elements such as iron, nickel, oxygen, silicon, etc. Its energy is created in the deep zone of the nucleus, with very high temperature and pressure and there are nuclear reactions. Studies carried out by scientists have found that 700 million tonnes of the hydrogen element are turned into ashes of the helium element, exactly every second.
