Star's Life

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A star is a giant ball of gas in space fuelled by
nuclear reactions in its core. You can see
several thousand stars on a clean night's sky.
The stars that the naked eye can see are only
the brightest stars. Astronomers have found
millions more stars by using powerful
telescopes to probe the sky. Our star, the Sun,
is an ordinary star. Compared to the Sun, some
stars are giants. They each contain enough
matter to make hundreds of stars.
· The closer a star is to Earth, the brighter it looks.
· Astronomers call a star's brightness its magnitude.
· The brighter a star is, the smaller or lower its magnitude is.
· Stars of magnitudes 6+ are too faint to be seen with the naked eye.
· A star's magnitude (brightness) is given by a number.
· Most stars are not single stars like the Sun. They have at least one
companion star.
· The two stars orbit each other.
· Some pairs of stars look like they are close together because they
lie in the same direction from Earth, but their movements show
that they are not orbiting each other.
· Sometimes two stars are so close together that one star sucks gas
off the other star.
· Extra gas falling on another star may explode in a giant blast called
a nova.
· Some of the names we know stars by today were given to them by
ancient Greek and Arab astronomers two thousand years ago.
· Today, new stars are identified by numbers, often with the name of
the person who discovered them and the year of discovery.

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All stars are born from clouds of dust, and end their lives in violent
circumstances. They begin life as dwarfs before changing into
giants or supergiants as they heat up. Depending on how much
mass they start out with, they end their lives in a variety of
different ways.
The Birth of a Dwarf Star
· New stars come from giant clouds of dust and gas.
· Knots begin to form in the gas cloud as gravity pulls it together.…read more

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The Death of a Supergiant
· Like a dwarf, a supergiant starts its life in the same way, but it is
much hotter and brighter and can be hundreds of times the
diameter of the Sun.
· After a brilliant but short life, a supergiant explodes itself . This
is called a supernova.
· A supernova leaves behind an extremely dense remnant such as
a neutron star or a black hole.…read more

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Stars operate on nuclear fusion. They operate on E=mc2, turning a
little bit of mass into a whole lot of energy.
How basic stars work:
Hydrogen (atomic weight 1.008) is pulled into the star by gravity.
Four hydrogen atoms get fused together to form one helium atom
(atomic weight 4.003). If you look at the atomic weights (4H - 1He)
there is a little bit of mass lost. It turns to energy.…read more

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