star-sphere of hot gasses gives off light and heat
only star you can see in daytime is the sun
sun is average size star, closest star to earth
cooler stars are red or orange, hotter stars are white or blue
sun is 5 billion years old
light year-distance light travels in 1 year (10 trillion km)
a star you see today may have stopped glowing many years ago, but the light is still traveling to earth
galaxies-stars found in large groups
our galaxy is the Milky Way
many galaxies may be undiscovered
our closest neighbor galaxy is Andromeda
constellation-group of stars that make a pattern in the sky
some stars and constellations only appear in the northern or southern hemisphere of earth, it depends on where you look at the constellation from on earth
as the earth travel in it's orbit, you see different constellations
before clocks and satellites, farmers used the stars to tell seasons
the north star is always in the northern sky
an observatory is a place you can go to watch and study stars
sun is made of layers also
much of the suns energy is released as heat and light
producers use the sun's energy to make food for themselves and consumers
sun's heat makes water evaporate (turn into gas or vapor)
sun drives winds, ocean currents, storms
sun's light and energy can cause damage to the eyes and skin, even on cloudy days
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