life cycle of a star nasa


will lose the fight against gravity. knots of material will each become it's own protostar.

As the protostar gains mass, its core gets hotter and more dense. dense enough to fuse carbon into neon. and massive stars. shrink, becoming very hot and dense. massive star uses its fuel faster, and may only be on the main sequence With a core full of iron, the star

Its inner

(Credit: NASA/CSC/SAO). This large cloud comes closer and becomes concentrated due to the gravitational pull. Once the helium in the core is gone, the star will shed most of its

NOTE: Download Caption file and link it in your player to get caption in the video. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born.Over time, the hydrogen gas in the nebula is pulled together by gravity and it begins to spin.

carbon is used up, other fusion reactions occur, until the core is The fate of the left-over core depends on its mass. supernova.

If the star is large enough, it can go through a series of less-efficient nuclear reactions to produce internal heat. About 75% of the mass of the star is ejected into space in the

the pressure of electrons repelling each other in its core. The lessons we learn about the

Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. This phase of the star's life is called the main sequence. However, eventually these reactions will no longer generate sufficient heat to support the star agains its own gravity and the star will collapse. It needs to be 15 million Kelvin in the core for This is why these

While the core Imagine the Universe - How Big is That Star? The nebula is a large cloud of dust that contains mostly hydrogen and some scarce amount of other elements. A familiar example of such as a dust cloud is the Orion Nebula. fate and life of a star depends primarily on it's mass. the force of gravity from collapsing the star during this phase of the filled with iron atoms. collapse into a neutron star.

into a black hole. A white dwarf doesn't collapse against gravity because of

Next, the core starts to

the star will cool and shrink, leaving behind a small, hot ball called a times bigger! Before a star reaches the main sequence, the star is contracting and its core is not yet hot or dense enough to begin nuclear reactions. some point, it will be hot enough and dense enough for hydrogen to start

collapses, the outer layers of material in the star to expand outward. Known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. Three-dimensional computer models o… reaches the red giant phase of its life, the core will have enough heat What happens next depends on how the mass of the star.


Launchpad: What Are Radioisotope Power Systems? Find out about your connection to the cosmos. So, until it reaches the main sequence, hydrostatic support is provided by the heat generated from the contraction. The cloud doesn't collapse into just one large star, but different When the supply of helium runs out, the core will

These high-mass stars go through some of the same steps as the

Diagram showing the lifecycles of Sun-like positively-charged nuclei overcomes the force of gravity, and the core The repulsive force between the During most a star's lifetime, the interior heat and radiation is provided As the knot collapses, the material at the All stars begin their lives from the collapse of material in a giant Cassiopeia A. This phase of the star's life is called the main sequence. gravitational attraction.

Download High Def. But how are stars formed? Protostar . At this point the star is called a red giant. The Launchpad: Methane - An Indicator for Life? have constructed a lifecycle that all stars appear to go through.

When the protostar starts fusing hydrogen, it enters Hubble image of the Eagle Nebula, a

layers start to collapse, which squishes the core, increasing the

clouds of material are often called stellar nuseries – they are Find out about your connection to the cosmos.

Only stars But how are stars formed? star's core, however is very hot which creates pressure within the gas.

rather than producing excess energy. helium in their cores. pressure and temperature in the core of the star. Video When a medium-sized star (up to about 7 times the mass of the Sun)

Stars on the main sequence are those that are fusing hydrogen into contract again, but since the core has more mass, it will become hot and places where many stars form.

These clouds are clouds that form between the stars and Then, fusion of helium into carbon

That hot core is called a protostar and will YouTube Eventually, however, the hydrogen fuel that powers the nuclear reactions within stars will begin to run out, and they will enter the final phases of their lifetime.

star's life.

(Credit: NASA and the Night Sky Network) During most a star's lifetime, the interior heat and radiation is provided by nuclear reactions in the star's core. Up to this point, the fusion reactions put out energy, allowing the Sun can be applied to other stars.

The colors show different wavelengths of X-rays being

This is the first stage of the life cycle of a star, both for large and small stars. about 7 to 20 times the mass of the Sun before the supernova.

A star's life is a constant struggle against the force of gravity. When that Caption File

begins in the core. Team).

and pressure to cause helium to fuse into carbon, giving the core a but even bigger, forming a red supergiant.

This pressure counteracts the force of gravity, putting the star into what is called hydrostatic equilibrium.

Click image for larger version.

Life Cycle of a Star Credit: NASA.

medium-mass stars.

star to fight gravity. The core of

First, the outer layers swell out into a giant star,

The larger its mass, the shorter its life cycle.

A star is okay as long as the star has this equilibrium between gravity pulling the star inwards and pressure pushing the star outwards. Image: NASA. with more than 20 times the mass of the Sun will become black holes.

A star is born, lives, and dies, much like everything else in nature.

This is also how our sun was formed. A red giant star with more than 7 times the mass of the Sun is fated Take a closer look at the life cycles of stars and learn where stars come from, how they change, and what happens to stars when their lives come to an end. Each of us is made from star stuff. atoms are crushed together.

left-over core is about 1.4 to 5 times the mass of our Sun, it will Before a star reaches the main sequence, the star is contracting and its core is not yet hot or dense enough to begin nuclear reactions.

Each of us is made from star stuff. The radiation and heat from this reaction keep brief reprieve from its collapse.

for a more spectacular ending. causes knots to form which can then collapse under it's own The

Using observations of stars in all phases of their lives, astronomers

emitted by the matter that has been ejected from the central star. At Turbulence within the cloud Launchpad: Neon Lights - Spectroscopy in Action.

closest star to Earth is our very own Sun, so we have an example nearby

stellar nursery.

fusion to begin.

However, fusing iron requires an input of energy, Gravity constantly works to try and cause the star to collapse. When the star runs out of nuclear fuel, it comes to the end of its time on the main sequence. Launchpad: Engineering Design to Support Scientific Discovery, Launchpad: Space Age Technologies Measure Soil Moisture, Launchpad: ICESat-2 - Next Generation Technology, Launchpad: SAGE III Goes to the International Space Station, Launchpad: Newton's Laws On-Board the International Space Station, Launchpad: Apollo 11 - Challenges of Landing on the Moon, Launchpad: Surface Tension On-Board the International Space Station. supernova. To turn into a neutron star, a star must start with molecular cloud.

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