Galaxies and the Universe

Front

What is the estimated number of galaxies in the universe?

Back

Billions

Front

How many main types of galaxies are there?

Back

Three

Front

What theory explains the origin of the universe as an expansion from an enormous explosion?

Back

Big Bang theory

Front

Where is our solar system located in relation to the Milky Way?

Back

On the edge

Front

Why can't we see the spiral shape of the Milky Way from Earth?

Back

We are located in one of its spiral arms.

Front

What are the three main types of galaxies?

Back

Spiral, elliptical, and irregular.

Front

What is the shape of the Milky Way galaxy?

Back

Spiral.

Front

What is the significance of the Big Bang theory in cosmology?

Back

It describes the beginning of the universe and its expansion.

Front

What is the approximate age of the universe according to the Big Bang theory?

Back

Between 13.8 and 14.8 billion years.

Front

What is the center of the Milky Way galaxy thought to contain?

Back

A supermassive black hole.