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Stars are made out of gas. We find out which kind star a specific star is by finding which elements it is made out of.

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Stars are celestial body in the universe, like sun.

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I know there are gas giants, terrestrial planets, asteroids, dwarf planet,

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They can blink in the sky beautifully!

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They are balls of gas and plasma in space.

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They are luminous balls of hot gas.

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A star is an astronomical object which has it own gravity.

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When stars explode does it create an explosion visible to the naked eye? do they happen years later because of light years?

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do

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Are there cold stars?

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As much as possible!!!!

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How many kinds of stars do we have? How do stars begin? How do stars end? What happen after the end of a star?

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Warm colored ones are cooler and cool colored ones are hotter.

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The sun is NOT the hottest star in our solar system.

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The Sun is actually one of the colder stars, and has a rather small mass.

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When the star is brighter, it will not always be hotter.

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When the star is brighter, it will not always be hotter.

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Stars come in almost every color of the rainbow, there are orange and even some yellow stars, but there are no green stars. It is because of the way our eyes see color...

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As stars continues its process of nuclear fusion, it fuses hydrogen to helium, and eventually fuses helium to carbon. After this happens, the sun don't have power to the fuse carbon together, so it loses its energy source and it collapses, its material expand outwards and leaves the core of the star. The core that is left behind is composed of nearly only carbon. Then, the electrons have great resistance when they were pushed together, but they are under great pressure. This resistance supports the core of the star. This is what called a white dwarf star. It is also very hot, and will generate rays such as ultraviolet rays and X-rays. These rays shone on the star material around it which has not move too far away, and they have reaction when they receive the rays, they glow. And they can surround the star in many different shapes, we call the planetary nebula. The white dwarf is small stars in the universe, and it’s super hot, and the gravity of it is much bigger than earth. If you are 75kg on Earth, then you are 75000kg on the white dwarf. Also white dwarf has radiation, one-two years are enough to get zapped by the white dwarf radiation, causing that gas to glow in response.

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When an 8-20 solar mass star ends its life, it does so with a bang: a supernova. Andere when it’s all over, there’s a couple of octillion tons of superheated plasma expanding away from the explosion site at a fraction of the speed of light, a whole mess of energy released in the form of light and neutrinos, and a bizarre little ball of quantum nastiness in the center composed almost entirely of neutrons. This is a neutron star. The properties of this neutron star are almost as bizarre as things get in the Universe.
Neutron stars are ridiculously dense. A single cubic centimeter of neutronium, as neutron star stuff is usually called, has a mass of about 400 million tons. It’s so dense that, as far as it’s concerned, normal matter is a slightly polluted vacuum.
A typical neutron star has a surface gravity 100 billion times stronger than Earth’s.
A freshly minted neutron star might spin several times per second.
A star like the Sun has an overall magnetic strength not too different from the Earth’s. But when that core collapses, the strength of the field skyrockets, and a neutron star can easily have a magnetic field several trillion times stronger than the Sun’s.
Neutron stars are more than just weird little balls of neutrons. They have a crust, probably a few centimeters thick, made of highly compressed but more or less normal matter, squeezed into a kind of highly stiffened crystal state.
(Felicia)

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So we can understand what a brown dwarf is, we must first understand the difference between a star and a planet.
To tell the difference between a star and a planet is not easy when you are looking up at the night sky.

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1. Hydrogen Fusion - stars make energy in their cores. Four (4) protons (plus some other elements) get turned into one helium nucleus
2. "The rate at which hydrogen fusion occurs depends on how much pressure the star has in its core."
3. A higher mass star puts more pressure on its core, where the helium is. That means, high mass stars burn out sooner than low mass stars.
4. The lower mass a star is, the longer its lifespan is.
5. The lowest mass stars are called "Cool Red Dwarfs".
6. Cool Red Dwarfs can last up to one trillion (1,000,000,000,000) years.

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Brown Dwarf is a a dwarf that way more massive than a planet but not enough massive than a star.
The way to determine a Brown Dwarf  is to look at whether or not there is Lithium, you can only see it using infrared light. You can find a Brown Dwarf easily in the sky because it emits green light. Brown Dwarf can fuse Lithium and Deuterium.

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Neutron stars are the smallest and densest stars. It borns after a big sun end its life, a part of its energy turns in to a supernova, others release  released in the form of light and neutrinos, and a bizarre little ball of quantum nastiness, then it becomes a new star which center composed almost entirely of neutrons.The neutron star has huge surface gravitation. It’s 100 billion times stronger than Earth’s.

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When the stars die, they can become either a white dwarf, a neutron star, or a black hole.

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When the stars die, they can become either a white dwarf, a neutron star, or a black hole.

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The lower mass the star is, the longer its lifespan is.

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White dwarf is super hot and it’s gravity is super strong. 

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White dwarf is super hot and it’s gravity is super strong. 

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High mass stars can form into black holes.

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Stars can come in all kinds of diffferent colours!