What are stars?

Answer 1

A star is a massive, luminous ball of plasma. Stars group together to form galaxies, and they dominate the visible universe. The nearest star is the Sun, which is the source of most of the energy on Earth, including daylight. Other stars are visible in the night sky, when they are not outshone by the Sun. A star shines because nuclear fusion in its core releases energy which traverses the star's interior and then radiates into outer space. Without stars, life on Earth and most atomic elements would not exist.

Astronomers can determine the mass, age, chemical composition and many other properties of a star by observing its spectrum, luminosity and motion through space. The total mass of a star is the principal determinant in its evolution and eventual fate. Other characteristics of a star that are determined by its evolutionary history include the diameter, rotation, movement and temperature. A plot of the temperature of many stars against their luminosities, known as a Hertzsprung-Russell diagram (H-R diagram), allows the current age and evolutionary state of a particular star to be determined.

A star begins as a collapsing cloud of material that is composed primarily of hydrogen along with some helium and heavier trace elements. Once the stellar core is sufficiently dense, some of the hydrogen is steadily converted into helium through the process of nuclear fusion. The remainder of the star's interior carries energy away from the core through a combination of radiation and convective processes. These processes keep the star from collapsing upon itself and the energy generates a stellar wind at the surface and radiation into outer space.[1]

Once the hydrogen fuel at the core is exhausted, a star of at least 0.4 times the mass of the Sun[2] expands to become a red giant, fusing heavier elements at the core, or in shells around the core. It then evolves into a degenerate form, recycling a portion of the matter into the interstellar environment where it will form a new generation of stars with a higher proportion of heavy elements.[3]

Binary and multi-star systems consist of two or more stars that are gravitationally bound, and generally move around each other in stable orbits. When two such stars have a relatively close orbit, their gravitational interaction can have a significant impact on their evolution.[4]

Answer 2

Stars are a product of growth. Dust in the Cosmos collect to form rocks, asteroids, comets and the like. They evolved into Moons and Planets, Gas Giants and then Stars. Jupiter is the next Star yet to be "born". It has already a massed a great number of moons that will graduate into Planets when Jupiter matures.

Answer 3

A star is a collection of gas, that is compressed by it's own gravity. Once it get s hot enough, due to this compression, nuclear fusion starts in the core, and will usually continue for billions of years!

Our star the sun, converts about 30 tons of hydrogen into helium a second through this process of nuclear fusion. The by products of this process are the light we see by, and the heat energy that warms our planet. It is hard to believe that we receive just a tiny amount of the energy produced, most just dissipates into empty space.

Answer 4

When you are sunbathing you are basking in the heat of the nearest star to earth, we call it the sun.
Stars are suns only very far away. There are billions of them. In fact for every grain of sand on every beach and desert, there is a star in the universe.

Answer 5

stars are vaccuous idiots who have only one talent and that is to aggrandize others who they envy. life as a star may reward the mealy mouthed idiots who feed from this sort of worship but all they do is encourage papparazzi and they are even worse than the pillocks they chase

Answer 6

Famous People..lol

Answer 7

A rusty sheriffs badge is star shaped.

Answer 8

A star is a massive, luminous ball of plasma

Answer 9

stars are like our sun balls of gas and fumes burning up,or you could say stars are heavenly bodies

Answer 10

watch channel 65 they talking bout stars now