what are stars
TRANSCRIPT
Chapter 7
Lesson 1What is a star?
Sun Facts
Our sun is really a star .It has the same characteristics as the other stars we see in the sky, but because it is the closest star to Earth and the Earth revolves around it, it is also called the Sun.
The sun contains different kinds of hot gases that interact in a special way to give off heat,
light and other kinds of energy.
How does a scientist know about the Sun if it is too hot to go there and they can’t touch it to examine it?
Scientists can get closer to it by using telescopes. Scientists can examine what the sun gives off in forms of energy. Scientists develop special tools such as a spectroscope to learn more about the sun.
Earth and Space Science•
The study of Objects in the sky
Words to know
star light year
What is a star?
Page 277
A star is a giant bal of hot glowing gasses that releases ENERGY.
A LIGHT YEAR is the distance light travels in one year.
On page 277, complete 1. Main Idea and Details
1. Main Idea:Light from stars takes time to reach the earth.
Types of stars
Page 276:Stars look like points of light as they are
very far away. Physical characteristics or PROPERTIES of
stars are:Size... Brightness...temperature...color
Scientists use these characteristics to describe stars.
Question:
What do scientists use to describe stars?
colour
brightness
size
temperature
Brightness of stars
Some stars are dim. Some stars are bright. Dim stars can be close to earth but
they seem far away.
Size of stars
Stars can be different sizes. Our sun star is average size. Stars size can change over time.
Temperatures and colours of stars
Stars can have different temperatures and colors.
Stars can be red, orange, yellow, blue and white.
A stars temperature is caused by its color.
Blue stars are hotter than orange stars.
Comaparing two stars
Page 276 In your journal, draw and Compare
and contrast Spica and our sun.
Spica sun
Comparing and contrasting two stars
SpicaLarger
than the sun.Spica glows blue
SunSmaller
than SpicaSun
glows yellow
Both are stars
Patterns of stars
Stars form in groups in the sky. They form patterns. The stars that make up the patterns
are very far apart from each other. The patterns the stars make, change
with the seasons. As Earth moves around the sun,
these patterns are in different parts of the sky.
Explain
How are stars different?
Explain
How are stars different?
Stars are different in color, Brightness , temperature and
size