What is universe. Big bang, expansion and fate of universe. Observable universe.Parallel worlds and multiverses. Standard model of universe, String theory, M(Membrane) theory. Hidden dimensions in space time. Our place in universe. Deep space.

What is a galaxy. Origin and evolution of galaxies. Early galaxies. Sizes and types of galaxies. Collision of galaxies. Galactic center. Our own galaxy. Galaxies moving away from one another cause expansion of universe. Galaxies found till today.

What is a star. Lifecycle of stars. Characteristics of stars. Astronomical ways of observing stars. Fate of stars(according to mass). Stellar remnants(quasars, black holes etc.). Sun, our own star. Stars found till today.

What is solar system. How solar system evolved. Different planets, their moons and their characteristics. Earth, our home in solar system. Inner and outer solar system.

What is a comet. Composition of comets. From where they come. Time periods of comets. Astronomical ways of observing comets. Comets found till today.

What is a meteor. Compositions of meteors. How meteors created. What are meteorites. Meteor showering. How meteors can be detected. Meteors found till today.

What is an asteroid. Composition of asteroids. From where they came. Asteroid impacts with earth and other planets. Asteroid impact that killed dinosaurs. Can asteroids collide again with earth.