1. 8th Grade
Week 18
review

2. Hydrogen Calcium Magnesium Based on this star’s spectra, which of
these elements is it burning?
Hydrogen
Calcium
Magnesium

3. Name each moon phase at each letter:K= J=
Third quarter
New moon
First quarter
Full moon

4. This means that when the moon is in its first quarter and third quarter phases -
High tides are at their lowest level

5. What is the correct order of phases
Wax crescent, first quarter, wax gib, full
Waning gibbous, third quarter,
waning crescent, new

6. What phase will we see one month later?
Full moon again!

7. What season is the
Southern hemisphere?
L=Summer
J= winter

8. F Which best represents the characteristics
of bodies and systems in the universe?

9. What do we call EVERYTHING that
is out there in space?
The Universe!

10. What shape galaxy is this:
Irregular Galaxy

11. The moon revolving around the Earth
What causes us to see the moon go
through phases?
The moon revolving around the Earth

12. Which type of lightwave has the
LOWEST frequency?
Radio!

13. Which type of star is at 10,000 solar units
3,000K?
giant

14. Which star color is the HOTTEST?
Blue

15. Where is Sol in our Galaxy?
Near the outer edge of one of the arms

16. Which type of tide is happening in
this diagram, and what could you
expect the ocean to do?
Neap Tide- hardly and difference
between high/low because the sun
cancels out the moon’s tides.

17. The Whirlpool Galaxy is a:
Spiral

18. What causes seasons?
Earth REVOLVING
Around the SUN

19. A lightyear is how many kilometers?
9.5 trillion km.

20. How far away is the next closest star
to Sol?
Proxima Centauri is 4.2 light years
away (about 40 trillion kilometers!)

21. What is the closest star to Earth?
Our sun, Sol!

22. Why is the equator hotter than the
poles?
Because it sticks out closer to the sun
and is never tilted away.

23. Distance And size of space Astronomers can use light years to
determine the -
Distance
And size of space

24. What type of galaxy is:
Spiral Galaxy

25. Which type of Lightwave has the
SHORTEST wavelength?
Gamma

26. Bigger = Brighter = Hotter
How is brightness, temperature, and
size related for Main Sequence stars?
Bigger = Brighter = Hotter

27. Centaurus-A is a:
Elliptical Galaxy

28. What is a galaxy?
A collection of billions of stars!

29. Which type of Lightwave has the
LONGEST wavelength?
Radio

30. What is the name
of our Galaxy?
The Milky Way

31. The Big Bang Theory What is the most popular explanation
for why the galaxies are spreading
farther apart?
The Big Bang Theory

32. Bigger, Hotter, or CLOSER to us
Name 3 things that would make a star
look BRIGHTER to us here on Earth.
Bigger, Hotter, or CLOSER to us

33. The center is a sun, with planets around the outside.
When a new star system is formed,
what is the center, and what is around
the outside?
The center is a sun, with planets
around the outside.

34. Which type of Lightwave has the
HIGHEST frequency?
Gamma

35. What is a Lightyear?
The distance light travels in one year