1. ASTRONOMİ VE UZAY BİLİMİ Astronomy and Space Science Astrophysics

2. Galaxy A galaxy is a massive, gravitationally bound system consisting of stars, stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component called dark matter.

3. The Milky Way Galaxy The Milky Way galaxy is a spiral galaxy consisting of over 400 billion stars, plus gas and dust arranged into three general components as shown to the left: The halo - a roughly spherical distribution which contains the oldest stars in the Galaxy, The nuclear bulge and Galactic Center. The disk, which contains the majority of the stars, including the sun, and virtually all of the gas and dust

7. ACCRETION: This is the growth of a massive object by gravitationally attracting more matter, typically gaseous matter in an accretion disc. This is also a phenomena that resulted in the formation of many of the moons orbiting the planets in our solar system. MOON:All moons have one thing in common – They are all “natural satellites held in position by gravity” GALAXY: A galaxy is a massive, gravitationally bound system consisting of stars, stellar remnants, an interstellar medium of gas and dust, and an important but poorly understood component called dark matter.

8. Communication on Earth using Satellites

9. Audio Radio-waves “Line-of-Sight” Signal bouncing and bending Satellites

10. Communication on Earth using Satellites

13. Asteroid 2012-DA14