1. Celestial Objects

2. Name as many natural objects in space as you can…
G_ _ _ _ _ _ _
C _ _ _ _ _ _ _ _ _ _ _ _ _
The _ _ _
P_ _ _ _ _ _
The _ _ _ _
C_ _ _ _ _
A_ _ _ _ _ _ _ _
(or M_ _ _ _ _ _)

3. Name as many natural objects in the sky as you can…
Stars (balls of hot gases)
Galaxies
Constellations
(pattern of stars)
The Sun (a typical star)

4. Name as many natural objects in the sky as you can…
Planets (orbit a star)
The Moon (orbits Earth)
Comets (balls of ice and dust that orbit the sun in elliptical orbits)
Asteroids (space rocks that orbit the sun)
or Meteors (when they collide with Earth)

5. Seeing Celestial Objects
Look at these two pictures:
They are pictures of the same thing (Orion).
Why is the picture on the left so much more clear?

6. Light Pollution! The light from most stars and planets is very faint.
That is why we can’t see stars in the day. (They are still there!)
At night it is usually dark enough to see even the faint light from stars. However, if there is too much background light, then only the brightest objects will be seen.

7. What is the difference between these….
…and these?

8. Answer:
Objects like stars, and our Sun (which is a star), give off their own light.
Objects that emit their own light are said to be luminous.
Objects like planets and the Moon don’t give off there own light! They are non-luminous.
But if they don’t give off light, how do we see them???

9. Non-luminous objects REFLECT light from luminous objects like the sun!

10. With your desk partner, brainstorm as many differences between luminous objects, like stars, and non-luminous objects as you can.
Organize them into a chart like this:
luminous non-luminous
-emits its own light -reflects light