Exploring Galaxies: A Journey Through the Milky Way and Beyond

The video tutorial explains that galaxies are vast collections of gas, dust, and stars, with our Milky Way containing over 100 billion stars. It describes the three main types of galaxies: spiral, elliptical, and irregular, highlighting the structure of our spiral galaxy. The concept of a light year, the distance light travels in one year, is also introduced.

What are galaxies primarily composed of?

• Planets and moons

• Black holes

• Gas, dust, and stars

• Only stars

How many stars are estimated to be in our Galaxy?

• Less than a billion

• Around 10 billion

• Exactly 1 trillion

• More than 100 billion

Which type of galaxy is characterized by a thin disc with spiral arms?

• Elliptical

• Cluster

• Irregular

• Spiral

What shape does our Galaxy resemble?

• A pinwheel

• A pyramid

• A sphere

• A cube

What is a light year?

• The distance light travels in one year

• The time it takes for light to travel around the Earth

• The distance between the Earth and the Sun

• The time it takes for the Earth to orbit the Sun