STERILITY TESTING OF PHARMACEUTICALS ppt by DR.C.P.PRINCE
Life Cycles of Stars
1. LIFE OF STARS
BY: JULIA BERMEJO,
ANGELA ÁLVARO
AND ANDREA LÓPEZ
2. 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 the
star 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.
3. THE LIFE OF STARS
• A stars begins its life as a nebula. A nebula is an
enormous cloud of gas and dust. When
nebulae come together, their temperatura
rises and when they reach several million
degrees, a star is born
• Stars are basically made of hydrogen which is
the 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
4. 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 dust
and so are all living creatures.
The sun is approximately 4,500 million years old, half way throught its kife cycle.
5. 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.
15. 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
16. 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 the
brighter we see it.
Stars are not fixed, they move very fast in relation to each
other, at about 72,000 km/h
