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The sun is a yellow dwarf and is actually a very small star.

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1.The sun is a yellow dwarf.
2.The largest stars are called blue giants.

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1. How long it would take to get to the stars?
2. The planet names around known stars?

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What will happen to the Earth when the sun stops it's cycle and dies?

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What will happen when the Sun finishes its life cycle and it dies?

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Stars have life cycles and the Sun is a yellow dwarf.

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The sun is actually very small but it's just closer to us than other larger stars. It is a yellow dwarf.

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1. The sun is known as a yellow dwarf star.
2. Some of the largest stars are known as Blue Giants or Super Giant stars

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Our sun is a yellow dwarf star.
When a star runs out of gas it will explode into a supernova.

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Birth of the Sun

Look in the sky at night. It is filled with over 100 billion stars. But only one of those stars is precious to us, and we don't see it at night. That star is our Sun - the source of energy for life on Earth. The Sun is so important to life on Earth that it has been worshipped and studied for centuries. In ancient times, people believed the Sun was a burning ball of fire created by the gods. Later, people thought it was a solid object or a liquid ball. Now we believe it is a huge ball of hydrogen undergoing nuclear fusion.

Look at our universe. The Sun is huge! Over one million Earths could fit inside the Sun. Have you ever worried that our Sun will die? Did you ever wonder how it was born?

Our Sun is the closest star to Earth. To understand how the Sun was born, you need to know how a star is born. A star's life cycle is much like our human life cycle. A star is born, lives for a while, and dies. Our Sun's life began about 4.6 billion years ago like any other star in the universe, in a nebula, a giant interstellar cloud of dust and gas so far away we would need 100,000 years to reach it. This cloud was perfectly content and quiet. Then something happened that caused the cloud to collapse and start spinning until it formed a flat disc. Most of the material that was originally in the cloud ended up in one ball in the center of the disc. For 100,000 years the ball was squeezed tighter, and the temperature increased until it was hot enough to perform nuclear fusion in its core. Voila, a star is born. The rest of the material that didn't settle in to the center of the disc formed the planets, moons, asteroids and other parts of the solar system.

Once nuclear fusion started, our Sun was big enough and bright enough to be a main-sequence star. This stage of the Sun's life is a very stable time for the Sun. The pressure of gravity forcing everything in toward the center of the Sun is equal to the force of the energy from fusion that the Sun is doing in its core pushing outward.

So the Sun carries on its life as a main-sequence star, burning up the hydrogen fuel in its core. As it does so, the Sun's energy increases. This increase in energy isn't too good for Earth. In a billion years or so, the Sun's energy will be 10% more than it is today. This will cause an extreme greenhouse effect on Earth and all the water in our atmosphere will dry up.

In 3.5 billion years, the Sun will be 40% brighter than it is today and all oceans and glaciers and snow on Earth will evaporate. Nothing will be able to survive.

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stages of the sun's life cycle - video & lesson transcript | study.com

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Stages of the Sun's Life Cycle - Video & Lesson Transcript | Study.com

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Look in the sky at night. It is filled with over 100 billion stars. But only one of those stars is precious to us, and we don't see it at night. That star is our Sun - the source of energy for life on Earth.

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The sun is actually a yellow dwarf star.
And stars have life cycles that take millions of years to complete.

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1. There are trillions of stars in our universe, but we can only see about 3000 from Earth.
2. The life cycle of our Sun is 12 Billion years.

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Could a solar system have two "suns" and if it could would it be bad.

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What will happen when the sun finishes its cycle?

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1. Our star is much smaller then most of the other ones.
2. the Explosion of a star is a supernova

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What will happen to us when the sun burns out?

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https://www.youtube.com/watch?v=GvBdmIgfntU

https://www.youtube.com/watch?v=yJVy9P3XSVE

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As a star dies, it will lose it's gravity so when our sun does start to die, will the planets start to move off their orbits

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1. How hot are stars?
2. Are there still stars visible that have gone cold in the galaxy?

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We can only see about 3,000 stars from earth. The sun is a yellow dwarf star.

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This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B. Astronomers overexposed the image of Sirius A so that the dim Sirius B (tiny dot at lower left) could be seen. The cross-shaped diffraction spikes and concentric rings around Sirius A, and the small ring around Sirius B, are artifacts produced within the telescope's imaging system. The two stars revolve around each other every 50 years. Sirius A, only 8.6 light-years from Earth, is the fifth closest star system known.

Credit: NASA, H.E. Bond and E. Nelan (Space Telescope Science Institute, Baltimore, Md.); M. Barstow and M. Burleigh (University of Leicester, U.K.); and J.B. Holberg (University of Arizona)

Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars. These stars can range from about a tenth of the mass of the sun to up to 200 times as massive.

Stars start their lives as clouds of dust and gas. Gravity draws these clouds together. A small protostar forms, powered by the collapsing material. Protostars often form in densely packed clouds of gas and can be challenging to detect.

"Nature doesn't form stars in isolation," Mark Morris, of the University of California at Los Angeles (UCLS), said in a statement. "It forms them in clusters, out of natal clouds that collapse under their own gravity."

Smaller bodies - with less than 0.08 the sun's mass - cannot reach the stage of nuclear fusion at their core. Instead, they become brown dwarfs, stars that never twinkle. But if the body has sufficient mass, the collapsing gas and dust burns hotter, eventually reaching temperatures sufficient to fuse hydrogen into helium. The star turns on and becomes a main sequence star, powered by hydrogen fusion. Fusion produces an outward pressure that balances with the inward pressure caused by gravity, stabilizing the star.

How long a main sequence star lives depends on how massive it is. A higher-mass star may have more material, but it burns through it faster due to higher core temperatures caused by greater gravitational forces. While the sun will spend about 10 billion years on the main sequence, a star 10 times as massive will stick around for only 20 million years. A red dwarf, which is half as massive as the sun, can last 80 to 100 billion years, which is far longer than the age of the universe. (This long lifetime is one reason red dwarfs are considered to be good sources for planets hosting life, because they are stable for such a long time.)

Bright shining star

In the early 20th century, astronomers realized that the mass of a star is related to its luminosity, or how much light it produces. These are both related to the stellar temperature. Stars 10 times as massive as the sun shine more than a thousand times as much.

The mass and luminosity of a star also relate to its color. More massive stars are hotter and bluer, while less massive stars are cooler and have a reddish appearance. The sun falls in between the spectrum, given it a more yellowish appearance.

This understanding lead to the creation of a plot known as the Hertzsprung-Russell (H-R) diagram, a graph of stars based on their brightness and color (which in turn shows their temperature). Most stars lie on a line known as the "main sequence," which runs from the top left (where hot stars are brighter) to the bottom right (where cool stars tend to be dimmer). [Video: Constructing the Hertzsprung-Russell Diagram (Hubble site)]

When the stars go out

Eventually, a main sequence star burns through the hydrogen in its core, reaching the end of its life cycle. At this point, it leaves the main sequence.

Stars smaller than a quarter the mass of the sun collapse directly into white dwarfs. White dwarfs no longer burn fusion at their center, but they still radiate heat. Eventually, white dwarfs should cool into black dwarfs, but black dwarfs are only theoretical; the universe is not old enough for the first white dwarfs to sufficiently cool and make the transition.

Larger stars find their outer layers collapsing inward until temperatures are hot enough to fuse helium into carbon. Then the pressure of fusion provides an outward thrust that expands the star several times larger than its original size, forming a red giant. The new star is far dimmer than it was as a main sequence star. Eventually, the sun will form a red giant, but don't worry - it won't happen for a while yet.

"Some five billion years from now, after the sun has become a red giant and burned the Earth to a cinder, it will eject its own beautiful nebula and then fade away as a white dwarf star," Howard Bond, of Space Telescope Science Institute in Maryland, said in a statement.

If the original star had up to 10 times the mass of the sun, it burns through its material within 100 million years and collapses into a super-dense white dwarf. More massive stars explode in a violent supernova death, spewing the heavier elements formed in their core across the galaxy. The remaining core can form a neutron star, a compact object that can come in a variety of forms.

The long lifetime of red dwarfs means that even those formed shortly after the Big Bang still exist today. Eventually, however, these low-mass bodies will burn through their hydrogen. They will grow dimmer and cooler, and eventually the lights will go out.

Additional resources

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Main Sequence Stars: Definition & Life Cycle

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Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars. These stars can range from about a tenth of the mass of the sun to up to 200 times as massive.

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1.) If we can only see 3,000 stars from earth, then how do you know there are trillions of them

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https://www.youtube.com/watch?v=ld75W1dz-h0

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how close can i get to a blue star.

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https://www.youtube.com/watch?v=VVAKFJ8VVp4

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Super Giant Blue Star Supernova Explosion

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It is easier to see stars in the country because there are less buildings producing light.
The sun is a yellow dwarf.

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https://www.space.com › Science & Astronomy

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Cosmic Journeys examines the great promise of the Voyager mission and where it will lead us in our grand ambition to move out beyond our home planet. The two Voyager spacecraft are part of an ancient quest to push beyond our boundaries... to see what lies beyond the horizon.

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All About the Sun for Kids: Astronomy and Space for Children

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Brightest Supernova (SN 1987A) Ever Seen in the Large Magellanic Cloud

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SN 1987A Brightest Supernova Ever Seen in the Large Magellanic Cloud SN 1987A was the brightest exploding star seen in 400 years when astronomers spotted it on Feb. 23, 1987. The violent death of a star 20 times more massive than the Sun, called a supernova, created this stellar drama.

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How many stars can we see?
How much time/money would it take to get to another star?

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The Universe: Supernova (massive stars) Full Documentary HD 1080p

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Subscribe to New Documentary: On our channel a lot of interesting documentaries on such themes: to destroy the Land, kill the Earth, end of Earth, the death Land, death Land, doomsday, Armageddon, Apocalypse, space, about space, star, stars, universe, galaxy, big Bang the big Bang theory, constellation, planet, solar system,

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First SUPERNOVA caught by Hubble Telescope

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Animation made by NASA after Hubble telescope got photos from a supernova