Page 4 - Science E-Book Prep.3 2024-2025 1st term_Neat unit 3,4
P. 4
Science Department
Prep.3
*The solar system:
- It is the sun and eight planets
revolving around it.
- Our sun is also revolving around
the center of the Milky Way galaxy.
It takes about 220 million years to
complete one rotation around the center of the galaxy.
- The solar system is located in one of the spiral arms, on the edge of
the galaxy.
*How did the Universe originate:
Many scientists believe that our universe is emerged 15000 million year
ago by a massive explosion which is. Called Big Bang,
First Term 45
