2. Astronomy
Earth’s Place
in the Universe 2

3. Warm Up What do you think of when you hear astronomy?
What are you the most curious about in astronomy?
What do you know about astronomy?

4. What is Astronomy?
The science that studies the universe that deals with
Properties of objects in space
Laws under which the universe operates 4

5. Universe is made of galaxies which are made of many stars.

6. Some stars have planetary systems similar to our solar system
Some stars have planetary systems similar to our solar system. Earth is a satellite planet of one particular star

7. Hierarchy of the Universe
Universe- everything that exists
Galaxies- contain stars, other remnants, and sometimes planetary systems

8. Hierarchy of the Universe
Star- A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun

9. Hierarchy of the Universe
Planet- an astronomical object orbiting a star or stellar remnant that
is massive enough to be rounded by its own gravity,
is not massive enough to cause thermonuclear fusion, and
has cleared its neighbouring region of planetesimals.