- Astronomical Elements:
The majority of objects in the universe are found within galaxies. Huge collections of stars, gas, and dust make up galaxies. There are as many as a trillion stars in some galaxies. Less than a million stars may exist in the smaller galaxies.Situated within the Milky Way galaxy is the planet Earth. The Sun is one of the stars in that galaxy. All planets, including Earth, are revolving around the Sun. Moons, also known as satellites, orbit their planets. Comets and asteroids, which are smaller objects, likewise orbit the Sun. The solar system is made up of all these bodies.
- Study of Astronomy:
There are various ways astronomers investigate the cosmos. Some people work as professionals, which means that their job is their source of income. Some people study space objects as a hobby. We call them amateur astronomers.Some astronomers work in laboratories. There, they examine real samples of objects that spacecraft have gathered. These consist of dust particles, lunar rock samples, and meteorites.Telescopes are used by many astronomers to view far-off objects. The size of telescopes varies. Certain ones are manageable to be carried by hand. Large telescopes are frequently kept in structures called observatories. As a floating observatory, the Hubble Space Telescope is in orbit around the planet Earth. The Hubble telescope captures and enlarges pictures of far-off celestial objects. Astronomers on Earth receive the data after that.Information about the Sun, Moon, and planets has also been gathered by other manned and unmanned spacecraft.To capture data about far-off objects, astronomers also employ cameras and other tools. Astronomers can visually record their observations with photographs. Spoken, difficult-to-find objects in space can be made visible with the aid of other instruments. These devices gauge the radiation, including light, that these objects emit.
Clocks and calendars did not exist thousands of years ago. People used the Sun and the stars to tell the time. To plant their crops and gather their harvests, they needed to be aware of the time. These people were the first astronomers.The most important astronomer in antiquity was Ptolemy of Alexandria, Egypt. He lived in the 100s ce. He created the theory that the Earth is at the center of the cosmos. He believed that Earth was surrounded by the other objects. For over a millennium, the majority of people held this Ptolemaic notion to be true.Nicolaus Copernicus presented a ground-breaking new theory in 1543. He held that the Sun is the center of gravity for Earth and the other planets. Copernicus faced criticism for questioning Ptolemy's theory.Great Italian scientist and astronomer Galileo Galilei provided observational evidence in favor of Copernicus' theory.Subsequent discoveries by astronomers confirmed Copernicus' theory. Johannes Kepler provided an explanation of how the planets orbit the Sun in the early 1600s. Isaac Newton acquired knowledge of motion and gravitation in 1687. Kepler's laws were supported by his work. Astronomers now understand that Copernicus was right. However, a lot of questions remain about the universe. Astronomers are still working to find the answers to those queries.
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