In Lesson 1, we will look at our Solar Systems, Galaxies, Clusters, Superclusters and The Universe.

Our Solar System is consists of our Sun, eight planets, dwarf planets, planet's moons, asteroids, comets and sednoids.

They are also three vast bands of drifting rocks and icy rocks where the asteroids and comets come from. They are the Asteroid Belt, the Kuiper Belt and Oort Cloud.

The Oort Cloud defines the end of our Solar System. It is the furthest where the influence of our Sun's gravity can reach, nearly a light-year away.

Image Credit: © WP / Wikimedia Commons / CC-BY-SA-3.0

Our solar system is a tiny part of a huge barred spiral galaxy called the Milky Way Galaxy.

Our solar system is located approximately 27,000 light years away from the Galactic Centre.

Scientists estimated our Milky way contains approximately 100 to 400 billion stars.

Image Credit: NASA/R. Hurt

In 1924, Andromeda Galaxy M31, became the first galaxy known to exist outside our galaxy. It is 1.5 times the size of Milky Way Galaxy. Andromeda Galaxy is the most distant object which can be seen by a naked eye.

Image Credit: Adam Evans / CC BY 2.0

This is a detailed map of our Universe. It shows the Cosmic Microwave Background Radiation leftover from the “Big Bang”. This image is mapped out by Wilkinson Microwave Anisotropy Probe (WMAP) spacecraft.

Image Credit: NASA / WMAP Science Team

About 13.8 billions years ago, a tremendous explosion started our Universe. At this time, the Universe was extremely dense and hot, and began to expand rapidly. The Universe began to cool sufficiently which allow energy to be converted to subatomic particles – neutrons, protons and electrons.

Image Credit: NASA/WMAP Science Team