LIFE OF STARS

BY: JULIA BERMEJO, ANGELA ÁLVARO AND ANDREA LÓPEZ

STARS• A star is a giant ball of gas at very high temperature which emit their own

light. A star shines and sends its energy as light and heat The Sun is thestar we know the best and it is the closer to the Earth. Stars have a beginning and an end: they are born, they develop and they die.

THE LIFE OF STARS

• A stars begins its life as a nebula. A nebula is anenormous cloud of gas and dust. Whennebulae come together, their temperatura rises and when they reach several milliondegrees, a star is born

• Stars are basically made of hydrogen which isthe fuel they use to emit light and heat.

• A each has its own lifespan. They live for millions or billions of years, but they don’t always shine.

• Stars may be young, middle or old. Those with a lot of mass live less because they produce a lot of energy and quickly spend their gas reserves.

Orion Nebula

A star can die in different ways, depending on its mass:

• Mediun sized and small stars, like the Sun, cool down and expand as they use up the hydrogen in their core, until they are extinguished.

• Bigger stars dissapear in a final explosion. Their remains are sent into space and as they cool down they form cosmic dust. Planets are made of that cosmic dustand so are all living creatures.

The sun is approximately 4,500 million years old, half way throught its kife cycle.

BLACK HOLES

• A star with a large mass may sink within itself and produce a black hole. All around, the stars are break and the gas is absorbed, can even absorbed light its strong gravity.

TYPE OF STARS

Protostar

RED GIANT STAR

White Dwarf Star

Red Dwarf Star

NEUTRON STARS

SupergiantStars

Colors of stars

• Stars have different colors. You can tell the temperature of a star by its color.

Stars with more energy have a shimmering blue luster.

Other stars, like the sun, goodbye yellow. They have an average temperature.

The coldest have a red

SIZE AND MOVEMENTS OF STARS

• The size and brightness of a star are closely related. Big stars are generally brighter than medium sized ones and these are brighter tan small ones. The nearer a star is thebrighter we see it.

Stars are not fixed, they move very fast in relation to eachother, at about 72,000 km/h