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Stars

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by

Max Pardo

on 16 April 2015

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Transcript of Stars

How hot are stars?
He is close: the color and temperature of a star is related to the star's brightness. Stars are measured by looking at their wavelengths obtained with optical filters of colored gas.
A star's color tells us how hot or cold it is.
Blue stars are hotter than 30,000K.
White stars are hotter than 10,000K.
Red stars are hotter than 3,000K.
What are stars?
She is somewhat right: a star is a big ball of gas made of gas and dust.
What are constellations?
Stars give off heat and light.
The Sun is a Star.
She is right: a constellation is a group of stars that can be found in formations that, when viewed from Earth, appear to take on various shapes.
Stars can be found in groups called binary or double constellations.
Thousands of stars in a group are called a global cluster.
Billions of stars in a group are called galaxies.

Stars

She is close: Sirius is the brightest star in the night sky.
Sirius is 20 times brighter than our sun.
Sirius is called the Dog Star because of its prominence in the constellation
Canis Major
.
What is the brightest star in the night sky?
Do stars change in size?
It's more complicated than that.
What do you know?

FACTS ABOUT A STAR'S LIFE CYCLE:

1. Opposing forces shape stars: the pressure in the core (pushing out) and the crushing force of gravity (pulling in).
2. Stars release hydrogen, and as this happens, the release of energy is insufficient to withstand gravitational pressure and the core of the star collapses.
3. But, compression by gravity raises the temperature in the star's core, and helium ash rekindles the nuclear fires which lift the star's outer zones against the force of gravity.
4. The star is now a red giant and after millions of years the reserve nuclear fuel will be exhausted. The outer layers disappear and only a white dwarf star remains.

So, yes, stars, do indeed, "grow"!
Full transcript