grade 3 science lesson by Mrs. Aisha

1. Where are
the stars
during the
?day

2. Sky report
Andromeda is a huge group of
stars in the shape of a disk.
Andromeda is normally not visible
. close to city lights

3. Andromeda appears to be just
a point of light. When you use
a telescope to view
Andromeda, it looks bigger
and appears to be a fuzzy
. star

4. What is a
?star

6. Star is a giant ball of hot ,
glowing gases that release
.energy

7.  Light from stars takes time to
reach Earth.
Light travels 300,000 kilometers
per second. That is fast!
Light from the sun , a star, takes
about eight and a half minutes to
reach Earth.
Light from other stars takes
longer.

8. The distance light travels from
stars is measured in light-years.
Light-year is the distance light
.travels in one year

9. Alpha Centauri is the next
nearest star to Earth. It is four
light-. years away from Earth

10. Types of stars

11. All stars except the sun look like
points of light because they are
very far away. Some stars appear
.brighter than others

12. Scientists use physical
characteristics such as:
1- brightness
2- size to describe stars.
3- color
4-temperature

13. Stars can produce different amounts of
light.
The sun is a very bright star.
The sun is the closest star to
. the Earth

15. The sun is an average-sized star

16. It may seem that bright stars in
the night sky are closer to Earth
than dim stars.
Actually, some stars that appear
dim may be closer to Earth than
.bright stars

17. bright star dim star

18. star`s distance from Earth is
not the only reason it appears
bright.
Other features affect the
brightness of stars besides its
.closeness to Earth

19. Our sun and most stars in the universe are similar.
However, stars can be different sizes.
The size of our sun is average.
Some stars are larger than our
sun Spica
Other stars are smaller Bessel
Over time, the size of a star can
.also change

20. The star Spica is larger than our sun

21. 260 light-years
Spica is about 260 light-years
away from Earth

22. Spica looks like a point of light in the sky
Spica is two blue stars that are very
close together

23. Bessel`s Star is . smaller than our sun

24. 11 light-years
It is 11 light-. years away from Earth

25. Bessel`s Star is two stars that are
very close. . They both glow orange

26. Stars have different temperatures
and colors. A star can be
red

27. orange

28. yellow

29. blue

30. white

31. A star`s color is a result of its
temperature.
For example, blue stars such as
Spica are hotter than orange
stars . such as Bessel`s Star

32. Patterns of stars

33. Groups of stars can be found in
distinct areas of the sky. Some
groups of stars seem to make
.patterns or shapes

38. The stars that make up these
patterns look like they are close
together in space.
They really are very far apart.
Some stars are farther from
Earth than others.
If you look at the same stars from far away in
space, they . would not make the same pattern

39. The patterns of stars you can
see change with the seasons.
As Earth moves around the sun,
these patterns are in different
.parts of the sky

40. Ursa Major, or the Big Bear is
.one of the patterns in the sky

41. Within Ursa Major, you can see
the Big Dipper. The Big Dipper
looks . like a cup with a handle

42. The star Caph is one star that makes
up the star pattern Cassiopeia.
It is the brightest . star in Cassiopeia

44. Caph is 54 light-years from Earth
and more than 25 times brighter
.than our sun

45. Because of its distance from Earth,
it . looks like a paint of light

49. The evolving universe