Characteristics of stars sizes of stars color of stars brightness of stars

1. Have you tried comparing the stars in a
cloudless sky at night? How do they differ
in size, color and brightness?
STARS

2. CHARACTERISTICS OF STARS

3. - are massive and luminous balls of
flaming gases, made up of mostly
hydrogen and some helium.
STARS
Sun – the nearest stars on earth, which
is the source of the most energy on
earth.

4. Viewing Stars
Stars can be viewed using
a telescope.
Hubble Space Telescope – one of the most famous telescopes made by
the United States National Aeronautics and Space or NASA.
- named after American astronomist Edwin
Hubble.

5. Two of the largest telescopes found in the
Philippines are found in Quezon City:
a) One is in Manila observatory, found
inside the campus of the Ateneo de
Manila University.
b) The other one is in PAG-ASA
Astronomical laboratory found inside
the campus of University of the
Philippines.
Viewing Stars

6. Sun – has a diameter of about 1,392,000
km, or 109 times about the diameter of
our planet.
Star Sizes
White dwarfs – about one hundredth the radius of the sun.
Neutron stars – measure only about 24 km across.
Red super giant – the largest. May have the radius of 1,000
solar radii.

7. Stars are also grouped together using
spectral classification.
Star Colors
Example
O type star - has a color blue and its temperature is over
30,000 degree Celsius.
B type star - is blue-white and is temperature is over 30,000
degree Celsius.

8. A type star - is white and is about 7,500 to 10,000 degrees
Celsius.
F Type star – is yellow-white but it is about 6,000 to 7,500
degree Celsius.
G Type star – is yellow and is about 5,000 to 6,000 degrees
Celsius ( the sun is a G star).
K Type star – is orange and is about 3,500 to 5,000 degrees
Celsius.
M Type star – is red and is less than 3,500 degree Celsius.
The duller the color of the star is, the cooler it is.

10. All the stars are separated from each other
at distances of lightyears.
Lightyear is a unit measurement defined
by the distance that light can travel in one
year.
Brightness of Stars
Astronomers devised two different systems to tell how bright a star is.
1. Apparent magnitude scale tells how bright a star is as it appears on
earth.
2. Absolute magnitude scale tells how bright the star really is.

11. Magnitude – is the term astronomers use
to measure the brightness of a star.
Brightness of Stars
 The brightest stars are first magnitude stars.
 The dimmest stars are the sixth magnitude stars.

12. The Life Cycle of a Star
• Stars are born in nebulae ( in singular form,
it is nebula).
• Young stars undergo further collapse, forming a main sequence
stars.
• An expanded star is a Red giant or supergiant
• Eventually collapse and explode and become either of the three :
a white dwarf, a neutron star or a black hole.

13. The Life Cycle of a Star

14. Thank you
Shine bright like a star