1. Unit E – Space Exploration The Distribution of Matter in Space
Lesson 4-2: (Sec 1.3)
The Distribution of Matter in Space

2. A. Stars
a is a
hot, glowing ball of gas (mainly hydrogen but also helium)
star
stars vary in
colour, size and density
stars are , stars are
hot
blue
Cooler
red
a shows that stars fall into
Hertzsprung-Russell Diagram
distinct groupings
slide 1 of 6

3. Hertzsprung-Russell Diagram
Sun
slide 2 of 6

4. B. Birth of a Star a is an accumulation of gas and dust nebula
steps in birth: 1.
swirling dust, gas collapse under gravity 2.
core mass and temperature increase 3.
core of material glows, forming a protostar 4.
when the core temperature reaches 10 million degrees C, fusion begins and a star is born
slide 3 of 6

5. C. Life & Death of a Star the determines the type of star
mass of a star
most stars start out in the
main sequence
the depends on the
mass of the star
life cycle
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6. sun-like stars red giant white dwarf black dwarf nebula
main sequence star
neutron star
(pulsar)
massive
stars
red
supergiant
supernova
black hole
slide 5 of 6

7. D. Galaxies a is a grouping of
millions or billions of stars, gas and dust held together by gravity
galaxy
can be
spiral shaped (Milky Way), elliptical, or irregular
slide 6 of 6

8. Assignment
Worksheet 3