3. At the end of the lesson, students should be able
to;
A.Determine the different sizes of the star,
b.classify the stars into its sizes, and
c.relate some stars that appear in the night’s sky.
4. “Sizes of the Star”
1.Each group will be given an activity sheet.
2. You are going to determine the sizes of the
star based on the given data on the activity
sheet.
9. Supergiants have the largest radius of all
known stars. They evolve from large main-
sequence stars. Supergiants can contain 8 -
200 times the mass of the Sun! They also
shine brightly.
The color of supergiants can be red or
blue.
10. Red supergiants have
low surface
temperatures, below
4,100 K. This is very
cool for a star and
makes them shine with
a red color.
Betelguese
11. Blue supergiants are
much hotter. They can be
12,000 to 15,000 K or
above 25,000 degree
Celcius, which makes them
the hottest stars in the
Universe.
Rigel
12. GIANT STARS-
any star having a relatively
large radius for its mass and
temperature; because the
radiating area is
correspondingly large, the
brightness of such stars is high.
POLLUX
14. Main Sequence Stars are young
stars.
They are powered by the fusion of hydrogen (H) into
helium (He) in their cores, a process that requires
temperatures of more than 10 million Kelvin.
.
15. These stars can range from
about a tenth of the mass of
the sun up to 200 times as
massive.
.
Sun
16. White dwarf-
low or medium mass star (with mass less than
about 8 times the mass of our Sun) will become a
white dwarf.
.
18. Multiple Choice: Choose the letter of the correct
answer.
1. These are the most massive and luminous stars
in the Universe
a.White dwarf star c. Giant star
b. Supergiant star
2. These can range from about a tenth of the mass
of the Sun up to 200 times as massive.
a. Main Sequence Stars c.White dwarf
b. Supergiant
.
19. 3. These are low or medium mass star (with
mass less than about times the mass of the our
Sun will become
a.Supergiant Star c. White dwarf
b.Giant star
4. Pollux has size of;
a. Giant star c. White dwarf
b. Supergiant Star
5.Sun has size of;
a.Supergiant star c. White dwarf
b. Main Sequence Star
20. Assignment. (In your notebook)
Find a star and determine its size. Give a short
explanation about it.
.
Editor's Notes
One supergiant can be as bright as a million Suns.
.,
One supergiant can be as bright as a million Suns.
.,
One supergiant can be as bright as a million Suns.
.,
Around 90 percent of the stars in the Universe are main-sequence stars, including our sun
Around 90 percent of the stars in the Universe are main-sequence stars, including our sun
Around 90 percent of the stars in the Universe are main-sequence stars, including our sun
irius B is a white dwarf. It is a very faint remnant of a previous star that has ended its main sequence life, gone giant, then died. It is apparent magnitude 8.44 which means you can’t see it with the naked eye.
Around 90 percent of the stars in the Universe are main-sequence stars, including our sun
Around 90 percent of the stars in the Universe are main-sequence stars, including our sun
