Download Stars - White Plains Public Schools

Stars
What is a star?
A star is a large
ball of gas, held
together by
gravity.
• Stars produce large amounts of
energy by the process of Nuclear
Fusion.
– Extreme amounts of heat & pressure are
needed.
– Our Sun converts hydrogen into helium
through the process of Nuclear Fusion.
Stars Cont.
STARS ARE SELF-LUMINOUS – they
light themselves. The moon and
planets reflect light from the Sun
(star).
Brain Pop: Our Sun
High Mass
Low Mass
Our Sun is an average sized star.
Compared to other stars it is not too
bright and not too hot. It’s just
perfect!
Characteristics of 4 stars
Brighter or
dimmer than
the sun?
Color of the
star
Surface
temperature
of the star
1. Sun
2.
3.
4.
Sun
Any other
star from the
HR diagram
Does the star
have a high,
medium or
low mass?
– As the mass of a
main sequence star
increases….
Main Sequence Stars
Luminosity
• This is an individual
task
• Please complete the
graph and write one
sentence explaining
the relationship.
Mass
Luminosity is how bright a star is
compared to the Sun if they were
the same distance away.
Stars are classified based on
luminosity and temperature.
Temperature affects the color of
stars.
Red = cool Blue = hot
Which object forms by the contraction of
a large sphere of gases causing nuclear
fusion of lighter elements into heavier
elements?
(1) comet
(2) planet
(3) star
(4) moon
Which process produces the energy that
allows the stars of the universe to
radiate visible light?
(1) convection
(2) nuclear fusion
(3) insolation
(4) radioactive decay
Exit Ticket: Numbered Heads
Together
1. Groups of 4 people. Each student number
off from one to four
2. Discussion Question: How do stars
relate to everyday life?
3. Make sure each member of the group can
answer the question if called upon.
Exit Ticket: Quiz your friend