Life Cycle of Stars

Life Cycle of Stars

Nuclear Fusion:

The stars begin their life as scattering clouds of wind and dust known as nebulae. The cloud begins to fall under its power, and part of this matter will begin to heat up and build up what is called ‘protostar’. When this protostar reaches 15 million degrees Celsius, it is hot enough to initiate nuclear fusion.

Nuclear Fusion:

The stars begin their life as scattering clouds of wind and dust known as nebulae. The cloud begins to fall under its power, and part of this matter will begin to heat up and build up what is called ‘protostar’. When this protostar reaches 15 million degrees Celsius, it is hot enough to initiate nuclear fusion.

Beginning of Nuclear Fusion:

The first step in nuclear fusion is to bind two hydrogen atoms together to form helium. The energy generated by this nuclear reaction prevents the star from getting under its own weight, and it makes it shine.

A single solar star will burn its hydrogen for about ten billion years, until all the hydrogen has combined to form helium. When this happens, the core begins to penetrate and further reactions begin to occur in the shell around its core. Eventually, a star the size of the Sun will enter into a contract and become a white lump.

The giant stars, three times the size of our Sun, will, however, be hot enough to become giant when their hydrogen is depleted. For the next millions of years they continue to produce heavy objects in the shells around their cores.


These stars end their lives with a massive explosion called a supernovae.

Neutron Star:

If the star was too small it would be a neutron star.

Black Hole:

If the star was too big it would be a black hole.

Yellow and red Dwarfs:

Our closest star, the Sun, is a yellow ball. When a star is larger than the 1.2-day solar eclipse it is classified as a red mass. The color of a star depends on its temperature; the hottest stars are blue and the coolest stars are red.

Toward the end of the astronomical life span, things begin to deteriorate further as they begin to emerge from the so-called ‘main sequence’ – the type of graphs astronomers use to distinguish different types of stars depending on their size and temperature.

Red Giant:

As our Sun gets older it will grow into a red coward – covering the inner planets, and perhaps the Earth. The red giants are bright stars, eight times the size of our Sun, in the final stages of life.

When the stars finally run out of gas to merge, they can have different fines depending on how they start.

White Dwarfs:

The white dwarf is about the size of a planet, the dense stars that form when the low-lying stars, about eight times the size of our Sun, run out of fuel.

Supernova and its types:

Probably the most remarkable end of the star’s life is an eruption called a supernova. This huge explosion, which can reach as high as ten billion days, occurs only when the giant stars run out of fuel.


There are two types of supernovae.

The first occurs in binary star systems when one of the two stars steals the essence of the corresponding star. Eventually, the white crack collects too many objects, causing the star to explode, resulting in a massive rise.

The second type of supernova occurs at the ending of the life of a single star. As the star runs out of nuclear fuel, its size fades. Eventually, the context is too heavy to withstand its gravitational pull and the context collapses, leading to another supernova explosion.

Supernovae can leave neutron stars, dense stars you can imagine, or if the explosion is large enough for a black hole.

Black holes:

A black hole is so thick and its gravity is so strong that even light can emit it. In the middle of a black hole, known as unity, gravity is inexhaustible. A black hole containing Earth weight could fit in the palm of your hand.

Supermassive black holes:

But black holes are not always small. Supermassive black holes are large black holes and can reach millions of times the size of our Sun. There is a magnificent black hole in the middle of the well-known galaxies.

Active galactic nuclei:

Active galactic nuclei or AGN is another name for a large black hole found in the center of the galaxy.


While not a time frame, entropy is important in all aspects of physics. It describes the amount of disturbances in the system, and the second law of thermodynamics states that entropy in the system is constantly evolving. In the 1970’s Stephen Hawking and Jacob Bekenstein introduced a law defining the entry of black holes, stating that entropy depends on the surface of the black hole and not the volume.


Supermassive black holes tend to power quasars – defined as a compact region surrounding a large black hole. These quasars emit powerful jets of gamma-ray radiation, deriving most of their energy from an object drawn into a black hole.

Neutron stars:

Neutron stars are also formed after the supernova explosion, when the supernova begins to shrink. They are wonderfully dense weather, but not as dense as black holes, with the weight of one and a half days compressed by the size of the city. Put another way, one teaspoonful of neutron star can weigh up to 900 times the Great Pyramid of Giza.


Pulsars are neutron stars that begin to rotate, as part of the supernova explosion effect. From Earth, they appear as intergalactic light bulbs that transmit light over and over again. This light comes from electromagnetic radiation jets emitted from the sides of a star.


Although many people use different names for constellations and constellations, there are differences. By its very definition, a galaxy or any other galaxy can be seen as a “separate business”. A cluster usually contains hundreds and thousands of stars while the galaxy contains billions, but many astronomers differ in their view of precise meaning.

Galaxies are held together by gravity and our galaxy, the Milky Way, has a black hole in the center. The Milky Way galaxy is an example of a galaxy that has produced one or two new stars a year.

Dwarf satellite galaxy:

A rare ‘small’ galaxy, such as the Small Magellanic Cloud, contains around a billion stars. However, the smaller galaxies officially recognized as galaxies, including the smaller galaxies of Leo I and II, contain only one million stars.

Just across our galaxy, in the Milky Way galaxy, there is a much shorter satellite galaxy called Virgo I. It is located on the side of the Virgo constellation and, at a magnitude of -0.8 in the optical waveband, is probably the lowest satellite galaxy ever discovered.

There are about 50 satellites in the Milky Way galaxy and about 40 of them are depleted and extinct, meaning they are part of another “dwarf spheroidal galaxy.”

Asteroids compared to Comets:

Although these terms are used interchangeably, asteroids and comets are different.


Comets are made of ice, rock, and living compounds that measure a few miles in diameter. When exposed to the light of day, the ices in the nucleus evaporate and form the ‘atmosphere’, which sometimes appears as a tail.


By comparison, most asteroids are made of rock, but some are made of metal, including nickel and iron. They vary in size from small boulders to hundreds of miles in diameter and a small portion of the asteroid population may be burnt comet stars whose curves have shrunk and blown into space. Almost all asteroids are part of the Main Asteroid Belt, which has orbits in the vast space region between Mars and Jupiter.

Absolute Zero:

The first point of total temperature at which all cellular movements cease.

Artificial Gravity:

This is actually the creation of centrifugal force by causing something like art, a well-known space station, to rotate slightly. This is just one attempt to mimic the natural environment.

The Astronaut:

The one chosen to fly in space.


The first spacecraft is in their spacecraft orbiting the earth. It is tightly packed and can last a long time for a healthy environment.

Command Module:

The business unit of the Apollo space which retains three-star crew and is the only re-entry of the large system used during the flight.

Communication Satellite:

A satellite equipped to operate as a central transmitter of a transmitting and receiving station with thousands of miles apart. This did not have to depend on the earth’s crust that was not always available between the two points.


The combination of two separate units in space even though they are not presented simultaneously. This requires careful selection of the orbit and speed of the chase car to find the tracked vehicle.


A device that can generate energy by burning fuel and is able to move itself as a result of feedback.

Space Suit:

A suit that can provide the required space for an astronaut in the event of cabin pressure failure. If he wishes to go outside around the ship as he walks through space, he will wear a temporary suit of space.


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