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The Sun

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The Sun ASSIGNMENT #41 The word – PowerPoint PPT presentation

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Title: The Sun


1
The Sun
Assignment 41
2
  • The word "solar" is taken from the Latin word for
    sun, Sol.
  • Solar System a large planetary system that
    consists of a combination of many smaller
    planetary systems and objects.

3
2 factors that keep planets orbiting around the
sun
  1. Inertia the resistance an object has to a
    change in its state of motion. The more mass an
    object has, the more inertia it has.
  2. Gravity force that holds planets in orbit
    around the sun.

4
The suns gravity is so strong because the suns
MASS is very large. 99.8 of the mass of the
entire solar system is in the sun!
5
Why arent we pulled into the sun?
The planets are in orbit around the sun because
the suns gravity pulls on them while their
inertia keeps them moving ahead.
6
Lets consider how changing inertia and/or
gravity would affect the position of a planet in
space
7
What would happen if the gravity of the sun, for
example, increased?
8
What would happen in the gravity of the sun, for
example, decreased?
9
What would happen in the inertia of the Earth,
for example, increased?
10
What would happen if the inertia of the Earth,
for example, decreased?
11
How big is the sun?
12
Solar flare
About 1 million Earths could fit inside the sun
13
Characteristics of the Sun
  • Has an interior and an atmosphere.
  • Does not have a solid surface.
  • Is a ball of glowing gas.
  • About ¾ of the suns mass is hydrogen (H), ¼ is
    helium (He) and very small amounts of other
    chemical elements.

14
Why are there stars (such as the sun)?
They are the result of constant nuclear fusion
He Heat energy Light energy
15
What is the source of a stars energy?
Nuclear Fusion hydrogen atoms join together to
form helium
He Heat energy Light energy
16
Where does this nuclear fusion occur in a star
(such as our Sun)?
He Heat energy Light energy
in the core
17
What is the core of any star (such as the Sun)?
Its the innermost part of the star where fusion
occurs. When the energy source of the Sun, its H,
is used up, the Sun will no longer give off
heat or light energy. It will die.
18
Nuclear fusion occurs only under conditions of
extremely high temperature and pressure. The
temperature inside the suns core, or center,
reaches about 15 million degrees Celsius, high
enough for nuclear fusion to occur.
19
How old is our sun?
Our sun is about 5 billion years old. It is
believed that the sun will last about another 5
billion years.
20
The core is the part of the sun in which fusion
occurs, so its like the birthplace of the
star What is the rest of the sun made of?
Layers of atmosphere
21
The suns visible layer, the photosphereis the
layer of gas that we see. When you look at an
image or photograph of the sun, you are looking
at the photosphere.
The Greek word photo means light, so
photosphere means the sphere that makes light.
22
This photo shows the red chromosphere, which is
the layer above the photosphere.
The Greek word chromo means color, so the
chromosphere is the color sphere.
23
This photo of the chromosphere was taken with a
special camera, so you can clearly see that it is
a red layer that completely surrounds the sun. In
this photo, you can also see the brighter
photosphere peeking through.
24
You can see the very faint, usually invisible
outer layer of gas calledthecorona. Do you see
what appears to be a halo or crown?
25
What are some of the features of the sun?
Prominence
Solar Flare
Sunspots
26
What do sunspots really look like (close-up view)?
27
What are sunspots?
  • Are they darker or lighter than the rest of the
    Sun?
  • Do you think that they are areas that are cooler
    or warmer than the rest of the Sun?

28
Sunspots usually occur in pairs or groups.
Reddish loops of gas called prominences link
different parts of sunspot regions.
Prominence- arching of gases on the sun
29
Solar flare- sudden temporary outburst of energy
from a small area of the sun's surface.
30
Sometimes the loops in sunspot regions suddenly
connect, releasing large amounts of energy. The
energy heats gas on the sun to millions of
degrees Celsius, causing the hydrogen gas to
explode out into space. These explosions are
known as solar flares.
31
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