What is astronomy explain briefly
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Definition of astronomy: Astronomy is the study of the sun, moon, stars, planets, comets, gas, galaxies, gas, dust and other non-Earthly bodies and phenomena. In curriculum for K-4 students, NASA defines astronomy as simple “the study of stars, planets and space.” Objects of interest include planets, moons, stars, galaxies, and comets; while the phenomena include supernova explosions, gamma ray bursts, and cosmic microwave background radiation. More generally, all astronomical phenomena that originate outside Earth's atmosphere are within the purview of astronomy. Astronomy is the scientific study of all objects beyond our world. The word comes to us from the ancient Greeks, and is their term for "star law", It is also the science that allows us to apply physical laws to help us understand the origins of our universe and the objects in it. Both professional and amateur astronomers have interests in understanding what they observe, although at different levels.
This article focuses on the work of professional astronomers.
Branches of Astronomy
There are really two main branches of astronomy: optical astronomy (the study of celestial objects in the visible band) and non-optical astronomy (the use of instruments to study objects in the radio through gamma-ray wavelengths). You can break down "non-optical" into the wavelength ranges, such as infrared astronomy, gamma-ray astronomy, radio astronomy, and so on.
Today, when we think about optical astronomy, we mostly visualize the amazing images from the Hubble Space Telescope or close-up images of the planets taken by various space probes. What most people don’t realize though, is that these images also yield volumes of information about the structure, nature, and evolution of objects in our Universe.
Non-optical astronomy is the study of light beyond the visible. There are other types of observatories that function beyond the visible to make significant contributions to our understanding of the universe.
These branches of astronomy work together to teach us about the structure of the stars, planets, and galaxies.
Subfields of Astronomy
There are so many types of objects that astronomers study, that it is convenient to break astronomy up into subfields of study. One area is called planetary astronomy, and researchers in this subfield focus their studies on planets, both within and outside our solar system, as well as objects like asteroids and comets.
Solar astronomy is the study of the Sun. The scientists who are interested in learning how it changes, and to understand how these changes affect the Earth, are called solar physicists. They use both ground-based and space-based instruments to make nonstop studies of our star.
Stellar astronomy is the study of stars, including their creation, evolution, and deaths. Astronomers use instruments to study different objects across all wavelengths and apply the information to create physical models of the stars.
Galactic astronomy focuses on the objects and processes at work in the Milky Way Galaxy. It's a very complex system of stars, nebulae, and dust. Astronomers study the motion and evolution of the Milky Way in order to learn how galaxies are formed.
Meet a Few Pioneers of Astronomy
Over the centuries there have been countless innovators in astronomy, people who contributed to the development and advancement of the science. Here are some key individuals. Today there are more than 11,000 trained astronomers in the world, people who are dedicated to the study of the stars. The most famous historical astronomers are those who made major discoveries that improved and expanded the science.
Galileo Galilei (1564 - 1642) was the first to use a telescope to study the sky. He is sometimes credited (incorrectly) with being the creator of the telescope. That honor probably belongs to Dutch optician Hans Lippershey. Galileo made detailed studies of heavenly bodies. He was the first to conclude that the Moon was likely similar in composition to planet Earth and that the Sun’s surface changed (i.e., the motion of sunspots on the Sun’s surface). He was also the first to see four of Jupiter’s moons, and the phases of Venus. Ultimately it was his observations of the Milky Way, specifically the detection of countless stars, that shook the scientific community.
Isaac Newton (1642 - 1727) is considered one of the greatest scientific minds of all time. He not only deduced the law of gravity but realized the need for a new type of mathematics (calculus) to describe it. His discoveries and theories dictated the direction of science for more than 200 years and truly ushered in the era of modern astronomy.
Albert Einstein (1879 - 1955), famous for his development of general relativity, a correction to Newton’s law of gravity. But, his relation of energy to mass (E=MC2) is also important to astronomy, as it is the basis for which we understand how the Sun, and other stars, fuse hydrogen into helium to create energy.
This article focuses on the work of professional astronomers.
Branches of Astronomy
There are really two main branches of astronomy: optical astronomy (the study of celestial objects in the visible band) and non-optical astronomy (the use of instruments to study objects in the radio through gamma-ray wavelengths). You can break down "non-optical" into the wavelength ranges, such as infrared astronomy, gamma-ray astronomy, radio astronomy, and so on.
Today, when we think about optical astronomy, we mostly visualize the amazing images from the Hubble Space Telescope or close-up images of the planets taken by various space probes. What most people don’t realize though, is that these images also yield volumes of information about the structure, nature, and evolution of objects in our Universe.
Non-optical astronomy is the study of light beyond the visible. There are other types of observatories that function beyond the visible to make significant contributions to our understanding of the universe.
These branches of astronomy work together to teach us about the structure of the stars, planets, and galaxies.
Subfields of Astronomy
There are so many types of objects that astronomers study, that it is convenient to break astronomy up into subfields of study. One area is called planetary astronomy, and researchers in this subfield focus their studies on planets, both within and outside our solar system, as well as objects like asteroids and comets.
Solar astronomy is the study of the Sun. The scientists who are interested in learning how it changes, and to understand how these changes affect the Earth, are called solar physicists. They use both ground-based and space-based instruments to make nonstop studies of our star.
Stellar astronomy is the study of stars, including their creation, evolution, and deaths. Astronomers use instruments to study different objects across all wavelengths and apply the information to create physical models of the stars.
Galactic astronomy focuses on the objects and processes at work in the Milky Way Galaxy. It's a very complex system of stars, nebulae, and dust. Astronomers study the motion and evolution of the Milky Way in order to learn how galaxies are formed.
Meet a Few Pioneers of Astronomy
Over the centuries there have been countless innovators in astronomy, people who contributed to the development and advancement of the science. Here are some key individuals. Today there are more than 11,000 trained astronomers in the world, people who are dedicated to the study of the stars. The most famous historical astronomers are those who made major discoveries that improved and expanded the science.
Galileo Galilei (1564 - 1642) was the first to use a telescope to study the sky. He is sometimes credited (incorrectly) with being the creator of the telescope. That honor probably belongs to Dutch optician Hans Lippershey. Galileo made detailed studies of heavenly bodies. He was the first to conclude that the Moon was likely similar in composition to planet Earth and that the Sun’s surface changed (i.e., the motion of sunspots on the Sun’s surface). He was also the first to see four of Jupiter’s moons, and the phases of Venus. Ultimately it was his observations of the Milky Way, specifically the detection of countless stars, that shook the scientific community.
Isaac Newton (1642 - 1727) is considered one of the greatest scientific minds of all time. He not only deduced the law of gravity but realized the need for a new type of mathematics (calculus) to describe it. His discoveries and theories dictated the direction of science for more than 200 years and truly ushered in the era of modern astronomy.
Albert Einstein (1879 - 1955), famous for his development of general relativity, a correction to Newton’s law of gravity. But, his relation of energy to mass (E=MC2) is also important to astronomy, as it is the basis for which we understand how the Sun, and other stars, fuse hydrogen into helium to create energy.
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The study of heavenly bodies with the help pf observation instruments and naked eye is known as astronomy
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