The sun
a special star
long ago, people believed earth was the center of the solar system
and that other planets revolved around it. this theory was set forth by
ptolemy, a greek astronomer, around a. d. 150. in 1543, polish
astronomer nicolaus copernicus suggested that the sun is the center o
and that all the planets move around the sun religious leaders of
around the sun religious leaders of that time opposed this
tooos, an italian astronomer named galileo galilei argued in support of
copernicus's theory and was sentenced to prison because his beliefs went ag
onvinced people that the planets orbit the sun.
the sun is a mass of hot burning gases, mostly hydrogen and
elements present in the sun include iron, calcium, magnesium, and so
burning gases, mostly hydrogen and helium. other common
le iron, calcium, magnesium, and sodium. many people
mistakenly believe the sun is still while the planets move around it. actually, the
y motion. it rotates about once every 25 days, and it revolves around the center
of the rotating milky way galaxy in roughly 230 million years.
the sun is vital to life on earth. life as we know it could
the heat and light from the sun. light is required for photosynthesis, the food-mang
process in plants. our weather is also greatly affected by the sun.
scientists have been able to break up light from the sun into a spectrum.
from the sun into a spectrum. seven colors
appear in the spectrum: red, orange, yellow, green, blue, indigo, and violet.
hoy g. biv is in remembering the colors of the spectrum. each of its letters begins a
spectrum color, and the order of the letters corresponds to the arrangement of the
the spectrum
use the clues to fill in the blanks below. the first letter of each word is provided.
1. s
the center of our solar system
a planet's path around the sun
a major ingredient in the process of photosynthesis
a scientist who studies heavenly bodies
a color in the spectrum
our planet
polish astronomer who suggested the sun is the
center of the universe (first and last name)
iron and calcium, for example
a light acronym
9. r
10. g
the milky way is one of these
11. y
a color in the spectrum
our solars