What Is Astronomy ? Short Recap On Astronomy

Image Credit : Pixabay

Topic : what is astronomy ? short recap on astronomy

what is astronomy ?

Astronomy is the study of , life of the celestial bodies from Birth till death or end. In astronomy we mainly study about evolution, origin and Phenomena of the celestial objects, like Stars , moons , galaxies, planets , comets, asteroids and Nebulae.

The most attractive things we can see in the astronomy are the astronomical phenomenons like Gamma ray burst , Supernova explosions , blazers , pulsars and etc. Now let us learn what is the meaning of the astronomy ? and From where the word astronomy came from ?

According to authors of Wikipedia, astronomy is a greek word and the meaning of the astronomy is “the Science that studies the laws of the stars ” .

In the ancient time many civillizations were interested in astronomy and made Many methodical observations. Civillizations Like Greeks , Indians , Egyptians, Chinese , mayas and Many others civilization made observation on astronomy.

Since in the past time there were no telescopes , So the most of the predictions were done only through the methodical observations.

Well, we will not discuss more about this. Let’s do a quick recap on the thoughts and idea of the ancient civilization and also what were their experience with the astronomy.

In astronomy there are many branches , But in the ancient time people from different regions only used to study about the astrometry.

Now the question is what is astrometry , well astrometry is the branch of astronomy in which we study about mapping of the stars.

Or in a simple words we can say in astrometry we study about the position of the stars. In the ancient time people believed was that the earth was in the centre of the universe with the sun , and all other stars , moons were rotating around it. However they were wrong.

Many other events like Lunar eclipse and solar eclipse were discovered in the past time. And also that, it is impossible to ignore their contributions in development of the Astronomy in the early age.

So this is all about Astronomy now let us learn about types of astronomy and also about different field of astronomy.

Also Read : Betelgeuse : (A Mysterious Star) ,Facts You Should Know 2021


What is Observational astronomy ?

The main source of information about celestial bodies and other objects is visible light, or more commonly electromagnetic radiation.

Observational astronomy can be classified according to the respective region of the electromagnetic spectrum over which observations are made.

Some parts of the spectrum can be seen from the Earth’s surface, while other parts can only be seen from high altitudes or outside Earth’s atmosphere.

Types of Observational astronomy :

  • Radio astronomy
  • Infrared astronomy
  • Optical astronomy
  • Ultraviolet astronomy
  • X-ray astronomy
  • Gamma-ray astronomy
  • Astrometry

Radio astronomy :

Radio astronomy uses radiation with wavelengths greater than approximately one millimeter, outside the visible range. Radio astronomy is different from most other forms of observational astronomy in that the observed radio waves can be treated as waves rather than as discrete photons.

Hence, it is relatively easier to measure both the amplitude and phase of radio waves, whereas this is not as easily done at shorter wavelengths.

Although some radio waves are directly emitted by celestial bodies, which are a product of thermal emission, most radio emissions that are observed are the result of synchrotron radiation, which is produced when electrons orbit a magnetic field.

Additionally, interstellar character spectral lines, specifically 21 para spectral lines, are spectral lines on the radio.

A wide variety of other objects are observable at radio wavelengths, including supernovae, interstellar gas, pulsars, and active galactic nuclei.

Infrared astronomy :

Radiant radiation has been selected for radiation, which is more attractive than red light and there are radiations which are suitable for radiation.

The infrared spectrum is useful for studying objects that are too cold to radiate visible light, such as planets, circumstellar disks or nebulae whose light is blocked by dust.

Long wavelengths of infrared can penetrate dust clouds that block visible light, allowing observation of molecular clouds and young stars embedded in the cores of galaxies.

Optical astronomy :

Historically, optical astronomy, also known as visible light astronomy, is the oldest form of astronomy. The images of the observations were originally drawn by hand.

In the late 19th century and for much of the 20th century, images were made using photographic equipment.

Modern images are created using digital detectors, typically using charge-coupled devices and recorded on a modern medium.

Although the visible light itself extends from about 4000 to 7000 (400 nm to 700 nm), the same instrument can be used to observe some near-ultraviolet and near-infrared radiation.

Ultraviolet astronomy:

Amazing knowledge also goes into the atmosphere moving in the atmosphere at the mid-wavelength atmosphere of 100 and 3200 (10 to 320).

For example : It contains blue stars from other galaxies, which have been the target of many ultraviolet surveys.

Other objects commonly seen in ultraviolet light include planetary nebulae, supernova remnants, and active galactic nuclei.

However, since ultraviolet light is readily absorbed by interstellar dust, adjustment of ultraviolet measurements is necessary.

X-ray astronomy :

X-ray is x-ray waveform use specifically, X-ray-preserved transform lenses (translated in English as observer).

All X-rays are emitted from high-altitude clusters, galaxies, or X-rays from the atmosphere. Notable X-ray sources include X-ray binaries, pulsars, supernova remnants, elliptical galaxies, clusters of galaxies, and active galactic nuclei.

Gamma-ray astronomy:

Gamma ray astronomy looks at celestial objects at the shortest wavelengths of the electromagnetic spectrum. Gamma rays can be observed directly by satellites such as the Compton Gamma Ray Observatory or by special telescopes called the Atmospheric Cherenkov Telescope.

Cherenkov telescopes do not detect gamma rays directly, but rather flashes of visible light produced when gamma rays are absorbed by Earth’s atmosphere.


One of the oldest fields in astronomy, and in all the sciences, is the measurement of the positions of celestial bodies.

Historically, accurate knowledge of the positions of the Sun, Moon, planets, and stars has been essential in celestial navigation (the use of celestial bodies to guide navigation) and calendar making.

Careful measurement of planetary positions has led to a solid understanding of gravitational disturbances, and the ability to determine with great accuracy the past and future positions of planets, a process known as celestial mechanics.

The tracking of recent near-Earth objects will allow predictions of near-Earth encounters or potential collisions with those objects.

Also Read :  What Are Different Types Of Nebula ? Nebula

Theoretical astronomy :

Theoretical astronomers use a number of tools, including analytical models and computational numerical simulations; Each has its own special advantages.

Analytical models of a process are better at giving a broader insight into the heart of what is happening. Numerical models reveal the existence of events and effects otherwise unpublished.

Theorists in astronomy attempt to build theoretical models and from the results predict the observational outcomes of those models.

Observing the event predicted by a model allows astronomers to choose between several alternative or conflicting models, which is best at describing the event.

Theorists also try to build or modify models to take new data into account. In case of a discrepancy between the results of the data and the model, the general trend is to try to make minimal modifications to the model so that it produces results consistent with the data.

In some cases, a large amount of inconsistent data over time can lead to a complete abandonment of the model.

Some Other Important Field of Astronomy :

  • Astrophysics
  • Cosmology
  • Astrochemistry
  • Astrobiology


Astrophysics :

Astrophysics is the branch of astronomy that employs the principles of physics and chemistry “to ascertain the nature of celestial bodies rather than their position or motion in space”.

Objects studied include the Sun, other stars, galaxies, extrasolar planets, the interstellar medium, and the cosmic microwave background.

Their emissions are investigated in all parts of the electromagnetic spectrum, and the properties investigated include brightness, density, temperature, and chemical composition.

Because astrophysics is a very broad subject, astrophysicists typically apply many disciplines to physics, including mechanics, electromagnetism, statistical mechanics, thermodynamics, quantum mechanics, relativity, atomic and particle physics, and atomic and molecular physics.

Cosmology :

Cosmology is the study of origin and evolution of the universe.

Hubble Extreme Deep Field Observations of the large-scale structure of the universe, a branch known as physical cosmology, have provided a deeper understanding of the formation and evolution of the universe.

Fundamental to modern cosmology is the accepted theory of the Big Bang, in which our universe began at the same time, and then expanded to its current state over the course of 13.8 billion years.

The concept of the Big Bang can be traced back to the discovery of the microwave background radiation in 1965.

During this expansion, the universe went through several evolutionary stages.

In the very early moments, it is theorized that the universe experienced very rapid cosmic inflation, which homogenized the initial conditions. Subsequently, nucleosynthesis produced the elemental abundances of the early universe.

Astrochemistry :

Astrochemistry is the study of the abundance of molecules in the universe and their interactions with reactions and radiation.

The discipline is an overlap of astronomy and chemistry. The term “astrochemistry” can be applied to both the solar system and the interstellar medium.

In the meeting of the circle, such as in meteorites and for isotopes such as in the Solar System, this is the case for batteries that are interactor-friendly and battery-friendly.

The creation of the doctrine, the solar system from the position of the doctors, according to the atom and visualization, evolution and destiny.

Studies in this area contribute to the understanding of the formation of the Solar System, the origin and geology of the Earth, biogenesis, and the origin of climate and oceans.

Astrobiology :

Astrobiology is an interdisciplinary scientific field concerned with the origin, early evolution, distribution and future of life in the universe.

Astrobiology considers the question of whether extraterrestrial life exists, and how humans can detect it if it does. The term exobiology is similar.

Astrobiology uses molecular biology, biophysics, biochemistry, chemistry, astronomy, physical cosmology, exoplanetology, and geology to investigate the possibility of life on other worlds and to help identify organisms that live on Earth.

may differ from that. The origin and early development of life is an inseparable part of the discipline of astrobiology.

Astrobiology concerns itself with the interpretation of existing scientific data, and although speculation is entertained for reference, astrobiology is primarily concerned with hypotheses that fit firmly into existing scientific theories.

About the Post :

So far we have learnt many thing in this article, we saw the definition of astronomy and types of astronomy and also we saw some important fields of astronomy like astrophysics , cosmology, astrochemistry and astrobiology.
I hope you enjoyed reading this article so , that’s it for today . You can read other article , have a good day.