1. Space
Unit 2

2. Learning Goals
We are learning terms associated with the study of astronomy.
We are learning to identify objects in the night sky.

3. Definitions Astronomy: the scientific study of what is beyond Earth
Universe: everything that exists, including all energy, matter and space
Celestial object: any object that exists in space

4. Celestial Objects
Celestial Object(s)
Description

5. stars
a massive collection of gases, held together by its own gravity and emits huge amounts of energy
our star: The Sun

6. planets a large celestial object that travels around a star
our planet: Earth

7. Moons
a type of satellite (a celestial object that travels around a planet in a closed path (orbit))
our Moon

8. Asteroids small celestial objects composed of rock and metal
orbit the Sun but are too small to be considered planets

9. Meteoroids a piece of metal or rock that is smaller than an asteroid
usually burn up in the Earth’s atmosphere = shooting star
can cause craters

10. Comets
large chunks of ice, dust, and rock that orbit the Sun in a very long orbit
sublimates (turns from a solid to gas) as it gets close to the Sun forming a coma
2 tails

11. Solar Systems
consists of the Sun, the planets and their moons and other smaller celestial objects (i.e. comets, meteoroids and asteroids)

12. Galaxies a huge collection of stars, gas, dust, and planets
our Galaxy: the Milky Way

13. The Universe

14. Activity: Create a Horizon Diagram (Text Ref. Page 307)
Purpose: To create a diagram that shows the positions of celestial objects as seen against the horizon.
Materials & Procedure: Grab a flashlight then follow steps 2-4 on page 307 in Science Perspectives 9.
Observations: Draw your horizon diagram.
Analysis Questions: Answer questions A-C.

15. Learning Goals
We are learning terms associated with the study of astronomy.
We are learning to identify objects in the night sky.

16. Please complete
Read pages
Questions #1-9