STARS. Most of the information we have about stars comes from the study of our star, Sol aka Sun .

Most of the information we have about stars comes from the study of our star, Sol aka Sun

http://www.youtube.com/watch?v=32WyKgdBQgE

Structure of a star

Properties of stars -

Color determines temperature Blue/white - extremely hot &

bright and young

White Yellow Orange Red - cool & dim and

usually old

http://www.bing.com/videos/search?q=youtube+why+aren't+stars+green%3f&FORM=VIRE1#view=detail&mid=03E0DCA8D36B521BB69A03E0DCA8D36B521BB69A

WHY ARE THERE NO GREEN STARS?

Properties of stars

BRIGHTNESS is also called Luminosity and is determined by a stars ABSOLUTE & APPARENT MAGNITUDE

Stars can look big to us because They are close They are big They are very hot They are bright

Properties of a star

MASS (size)

Supergiants are the largest stars, and may have diameters several hundred times the size of the Sun.

Giants are more common than Supergiants, and have diameters 10 to 100 times as large as the Sun.

Medium-size or about as large as the Sun

White dwarfs are small dying stars (about the size of the planet EARTH).

Red Giants & Super massive red giants are dying stars, have cooler temperatures than other stars, and are not as bright, but their size is still massive.

Mass the amount of matter ( particles) the star contains

Stars are classified by mass and color

Properties of stars - mass

A stars mass determines its life cycle

Smaller mass stars live or last longest and may live hundereds of billions of years

Massive and Super Massive stars have very short life times only billions of years

Properties of stars

Diameter

Diameters of stars are determined by gathering three pieces of information;

1) distance 2) brightness 3) and color

WHY DO STARS TWINKLE?The scientific name for the twinkling is stellar scintillation (or astronomical scintillation). Stars twinkle when we see them from Earth because we are viewing them through the thick layers of Earth’s moving atmosphere

the light of the star is bent (refracted) many times and in random directions

Stars closer to the horizon appear to twinkle more than stars that are overhead

Stars do not appear to twinkle when viewed from outer space or from a planet/moon that does not have an atmosphere

DO STARS TWINKLE?

STARS. Most of the information we have about stars comes from the study of our star, Sol aka Sun .

Documents

Transcript of STARS. Most of the information we have about stars comes from the study of our star, Sol aka Sun .

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